diff --git a/tests/compile/test_config.py b/tests/compile/test_config.py
index 9e912c6d810d..8dd6959a01d0 100644
--- a/tests/compile/test_config.py
+++ b/tests/compile/test_config.py
@@ -392,39 +392,48 @@ def test_pass_config_deprecation(caplog_vllm):
     assert "enable_fusion is deprecated" in caplog_vllm.text
     assert config.fuse_norm_quant is True
     assert config.fuse_act_quant is True
-    assert config.enable_fusion is None
+    assert config.enable_fusion is True
 
     # Test enable_attn_fusion -> fuse_attn_quant
     caplog_vllm.clear()
     config = PassConfig(enable_attn_fusion=True)
     assert "enable_attn_fusion is deprecated" in caplog_vllm.text
     assert config.fuse_attn_quant is True
-    assert config.enable_attn_fusion is None
+    assert config.enable_attn_fusion is True
 
     # Test enable_noop -> eliminate_noops
     caplog_vllm.clear()
     config = PassConfig(enable_noop=True)
     assert "enable_noop is deprecated" in caplog_vllm.text
     assert config.eliminate_noops is True
-    assert config.enable_noop is None
+    assert config.enable_noop is True
 
     # Test enable_sequence_parallelism -> enable_sp
     caplog_vllm.clear()
     config = PassConfig(enable_sequence_parallelism=True)
     assert "enable_sequence_parallelism is deprecated" in caplog_vllm.text
     assert config.enable_sp is True
-    assert config.enable_sequence_parallelism is None
+    assert config.enable_sequence_parallelism is True
 
     # Test enable_async_tp -> fuse_gemm_comms
     caplog_vllm.clear()
     config = PassConfig(enable_async_tp=True)
     assert "enable_async_tp is deprecated" in caplog_vllm.text
     assert config.fuse_gemm_comms is True
-    assert config.enable_async_tp is None
+    assert config.enable_async_tp is True
 
     # Test enable_fi_allreduce_fusion -> fuse_allreduce_rms
     caplog_vllm.clear()
     config = PassConfig(enable_fi_allreduce_fusion=True)
     assert "enable_fi_allreduce_fusion is deprecated" in caplog_vllm.text
     assert config.fuse_allreduce_rms is True
-    assert config.enable_fi_allreduce_fusion is None
+    assert config.enable_fi_allreduce_fusion is True
+
+    # Test hash consistency
+    config_old = PassConfig(enable_fusion=True)
+    config_new = PassConfig(fuse_norm_quant=True, fuse_act_quant=True)
+    assert config_old.compute_hash() == config_new.compute_hash()
+
+    config_old = PassConfig(enable_async_tp=True)
+    config_new = PassConfig(fuse_gemm_comms=True)
+    assert config_old.compute_hash() == config_new.compute_hash()
diff --git a/vllm/config/compilation.py b/vllm/config/compilation.py
index 963b091939e0..d3d50e6ae7b2 100644
--- a/vllm/config/compilation.py
+++ b/vllm/config/compilation.py
@@ -4,7 +4,7 @@
 import enum
 from collections import Counter
 from collections.abc import Callable
-from dataclasses import asdict, field
+from dataclasses import field
 from pathlib import Path
 from typing import TYPE_CHECKING, Any, ClassVar, Literal
 
@@ -13,7 +13,7 @@ from pydantic.dataclasses import dataclass
 
 import vllm.envs as envs
 from vllm.compilation.inductor_pass import CallableInductorPass, InductorPass
-from vllm.config.utils import config, handle_deprecated
+from vllm.config.utils import config, get_hash_factors, handle_deprecated, hash_factors
 from vllm.logger import init_logger
 from vllm.platforms import current_platform
 from vllm.utils.import_utils import resolve_obj_by_qualname
@@ -196,7 +196,16 @@ class PassConfig:
         Any new fields that affect compilation should be added to the hash.
         Any future fields that don't affect compilation should be excluded.
         """
-        return InductorPass.hash_dict(asdict(self))
+
+        ignored_fields = [
+            "enable_fusion",
+            "enable_attn_fusion",
+            "enable_noop",
+            "enable_sequence_parallelism",
+            "enable_async_tp",
+            "enable_fi_allreduce_fusion",
+        ]
+        return hash_factors(get_hash_factors(self, ignored_factors=ignored_fields))
 
     @field_validator(
         "fuse_norm_quant",
@@ -267,14 +276,6 @@ class PassConfig:
             "v0.13.0 or v1.0.0, whichever is sooner",
         )
 
-        # Force old flags to None to ensure they are not used
-        self.enable_fusion = None
-        self.enable_attn_fusion = None
-        self.enable_noop = None
-        self.enable_sequence_parallelism = None
-        self.enable_async_tp = None
-        self.enable_fi_allreduce_fusion = None
-
         if not self.eliminate_noops:
             if self.fuse_norm_quant or self.fuse_act_quant:
                 logger.warning_once(