Hi David,
Are you trying to compare the attribute values or if the objects are the same?
For attribute values, you can use the object comparator module
https://appstore.home.mendix.com/link/app/35384/
For comparing if two objects are the same, you can just use an equal sign in an exclusive split.
Hope this helps!
Edit: I also see that the java action "memberhaschanged" is still in community commons.
https://github.com/mendix/CommunityCommons
Edit 2: I think the action you are looking for is in this module. This module was branched from community commons at Mx version 6.7
https://appstore.home.mendix.com/link/app/37114/Mendix/ObjectHandling