Does experience ownership transfer, transfer other things?

[13_5G (Soundmoji)]

Yes i believe it does. When this feature was officially released, it was stated that gamepasses, badges and dev products should be transferred:

Transfer Experiences to Groups & Track Group Activity

It most certainly does! All of your developer products (ie Game Passes, Badges etc) will fully persist through the transfer.

Hope this helps and have a nice day!