The new cloth is different. It's softer and thinner, but the same size.

If you want to spend 12 minutes on what changed, AppleInsider made a video: https://www.youtube.com/watch?v=iL-4kCkvEvQ

This is actually the 4th Apple Polishing Cloth. Here are all the variants I know:

  * Original one (reference size)
  * New one (reference size; softer/thinner)
  * Apple Vision Pro (slightly smaller, square, different colour)
  * Nanotexture Display (much smaller, rectangular)

I believe I got this cloth with my new MacBook Pro with the nano texture display was very different than the original.