The Platinum theme used by MacOS 8-9 was probably the closest-looking to that Windows 95 look and feel. And since Windows 2000 was a combination of that old look and feel on top of a modern kernel (NT), one might argue that the Mac OS X Developer Preview was the nearest Apple equivalent.

The first two Developer Preview versions of Mac OS X used the Platinum theme, not the Aqua theme that ultimately shipped with 10.0.

You can see screenshots here: https://guidebookgallery.org/screenshots/macosxdp1