VolumeCamera.CullingMask vs Camera.cullingMask

Is it just .net vs camel case convention, or do the culling masks work differently in VolumeCamera vs regular Camera component

Testing in Unity editor play mode, cullingMasks for either/both do not seem to work?

This seems to be a dupe of this question? Camera culling mask? VolumeCamera or Main Camera - visionOS / Mixed Reality (Immersive) Apps - Unity Discussions

–Tim

somewhat but also why is one .cullingMask and the other .CullingMask (camel case vs .NET case)