diff --git a/pandas/_libs/tslibs/timestamps.pyx b/pandas/_libs/tslibs/timestamps.pyx
index c166edf35946c..1fba963496ba7 100644
--- a/pandas/_libs/tslibs/timestamps.pyx
+++ b/pandas/_libs/tslibs/timestamps.pyx
@@ -324,7 +324,7 @@ cdef class _Timestamp(ABCTimestamp):
         elif other is NaT:
             return op == Py_NE
         elif is_datetime64_object(other):
-            ots = _Timestamp._from_dt64(other)
+            ots = Timestamp(other)
         elif PyDateTime_Check(other):
             if self.nanosecond == 0:
                 val = self.to_pydatetime()
diff --git a/pandas/tests/scalar/timestamp/test_comparisons.py b/pandas/tests/scalar/timestamp/test_comparisons.py
index b5084e7a8925e..510c29bd3893d 100644
--- a/pandas/tests/scalar/timestamp/test_comparisons.py
+++ b/pandas/tests/scalar/timestamp/test_comparisons.py
@@ -12,6 +12,13 @@
 
 
 class TestTimestampComparison:
+    def test_compare_non_nano_dt64(self):
+        # don't raise when converting dt64 to Timestamp in __richcmp__
+        dt = np.datetime64("1066-10-14")
+        ts = Timestamp(dt)
+
+        assert dt == ts
+
     def test_comparison_dt64_ndarray(self):
         ts = Timestamp("2021-01-01")
         ts2 = Timestamp("2019-04-05")