diff --git a/selfdrive/test/process_replay/compare_logs.py b/selfdrive/test/process_replay/compare_logs.py
index 7de0a25761..ce8cd2864e 100755
--- a/selfdrive/test/process_replay/compare_logs.py
+++ b/selfdrive/test/process_replay/compare_logs.py
@@ -5,6 +5,7 @@ import capnp
 import numbers
 import dictdiffer
 from collections import Counter
+from typing import Dict
 
 from openpilot.tools.lib.logreader import LogReader
 
@@ -89,7 +90,52 @@ def compare_logs(log1, log2, ignore_fields=None, ignore_msgs=None, tolerance=Non
   return diff
 
 
+def format_diff(results, log_paths, ref_commit):
+  diff1, diff2 = "", ""
+  diff2 += f"***** tested against commit {ref_commit} *****\n"
+
+  failed = False
+  for segment, result in list(results.items()):
+    diff1 += f"***** results for segment {segment} *****\n"
+    diff2 += f"***** differences for segment {segment} *****\n"
+
+    for proc, diff in list(result.items()):
+      # long diff
+      diff2 += f"*** process: {proc} ***\n"
+      diff2 += f"\tref: {log_paths[segment][proc]['ref']}\n"
+      diff2 += f"\tnew: {log_paths[segment][proc]['new']}\n\n"
+
+      # short diff
+      diff1 += f"    {proc}\n"
+      if isinstance(diff, str):
+        diff1 += f"        ref: {log_paths[segment][proc]['ref']}\n"
+        diff1 += f"        new: {log_paths[segment][proc]['new']}\n\n"
+        diff1 += f"        {diff}\n"
+        failed = True
+      elif len(diff):
+        diff1 += f"        ref: {log_paths[segment][proc]['ref']}\n"
+        diff1 += f"        new: {log_paths[segment][proc]['new']}\n\n"
+
+        cnt: Dict[str, int] = {}
+        for d in diff:
+          diff2 += f"\t{str(d)}\n"
+
+          k = str(d[1])
+          cnt[k] = 1 if k not in cnt else cnt[k] + 1
+
+        for k, v in sorted(cnt.items()):
+          diff1 += f"        {k}: {v}\n"
+        failed = True
+  return diff1, diff2, failed
+
+
 if __name__ == "__main__":
   log1 = list(LogReader(sys.argv[1]))
   log2 = list(LogReader(sys.argv[2]))
-  print(compare_logs(log1, log2, sys.argv[3:]))
+  ignore_fields = sys.argv[3:] or ["logMonoTime", "controlsState.startMonoTime", "controlsState.cumLagMs"]
+  results = {"segment": {"proc": compare_logs(log1, log2, ignore_fields)}}
+  log_paths = {"segment": {"proc": {"ref": sys.argv[1], "new": sys.argv[2]}}}
+  diff1, diff2, failed = format_diff(results, log_paths, None)
+
+  print(diff2)
+  print(diff1)
diff --git a/selfdrive/test/process_replay/model_replay.py b/selfdrive/test/process_replay/model_replay.py
index 0cdaf861e8..08f86b2b5e 100755
--- a/selfdrive/test/process_replay/model_replay.py
+++ b/selfdrive/test/process_replay/model_replay.py
@@ -10,8 +10,7 @@ from openpilot.common.params import Params
 from openpilot.system.hardware import PC
 from openpilot.selfdrive.manager.process_config import managed_processes
 from openpilot.selfdrive.test.openpilotci import BASE_URL, get_url
-from openpilot.selfdrive.test.process_replay.compare_logs import compare_logs
-from openpilot.selfdrive.test.process_replay.test_processes import format_diff
+from openpilot.selfdrive.test.process_replay.compare_logs import compare_logs, format_diff
 from openpilot.selfdrive.test.process_replay.process_replay import get_process_config, replay_process
 from openpilot.system.version import get_commit
 from openpilot.tools.lib.framereader import FrameReader
diff --git a/selfdrive/test/process_replay/test_processes.py b/selfdrive/test/process_replay/test_processes.py
index 973c16971e..e36548d7e5 100755
--- a/selfdrive/test/process_replay/test_processes.py
+++ b/selfdrive/test/process_replay/test_processes.py
@@ -9,7 +9,7 @@ from typing import Any, DefaultDict, Dict
 
 from openpilot.selfdrive.car.car_helpers import interface_names
 from openpilot.selfdrive.test.openpilotci import get_url, upload_file
-from openpilot.selfdrive.test.process_replay.compare_logs import compare_logs
+from openpilot.selfdrive.test.process_replay.compare_logs import compare_logs, format_diff
 from openpilot.selfdrive.test.process_replay.process_replay import CONFIGS, PROC_REPLAY_DIR, FAKEDATA, check_openpilot_enabled, replay_process
 from openpilot.system.version import get_commit
 from openpilot.tools.lib.filereader import FileReader
@@ -115,45 +115,6 @@ def test_process(cfg, lr, segment, ref_log_path, new_log_path, ignore_fields=Non
     return str(e), log_msgs
 
 
-def format_diff(results, log_paths, ref_commit):
-  diff1, diff2 = "", ""
-  diff2 += f"***** tested against commit {ref_commit} *****\n"
-
-  failed = False
-  for segment, result in list(results.items()):
-    diff1 += f"***** results for segment {segment} *****\n"
-    diff2 += f"***** differences for segment {segment} *****\n"
-
-    for proc, diff in list(result.items()):
-      # long diff
-      diff2 += f"*** process: {proc} ***\n"
-      diff2 += f"\tref: {log_paths[segment][proc]['ref']}\n"
-      diff2 += f"\tnew: {log_paths[segment][proc]['new']}\n\n"
-
-      # short diff
-      diff1 += f"    {proc}\n"
-      if isinstance(diff, str):
-        diff1 += f"        ref: {log_paths[segment][proc]['ref']}\n"
-        diff1 += f"        new: {log_paths[segment][proc]['new']}\n\n"
-        diff1 += f"        {diff}\n"
-        failed = True
-      elif len(diff):
-        diff1 += f"        ref: {log_paths[segment][proc]['ref']}\n"
-        diff1 += f"        new: {log_paths[segment][proc]['new']}\n\n"
-
-        cnt: Dict[str, int] = {}
-        for d in diff:
-          diff2 += f"\t{str(d)}\n"
-
-          k = str(d[1])
-          cnt[k] = 1 if k not in cnt else cnt[k] + 1
-
-        for k, v in sorted(cnt.items()):
-          diff1 += f"        {k}: {v}\n"
-        failed = True
-  return diff1, diff2, failed
-
-
 if __name__ == "__main__":
   all_cars = {car for car, _ in segments}
   all_procs = {cfg.proc_name for cfg in CONFIGS if cfg.proc_name not in EXCLUDED_PROCS}