Used to be that when the Rig Manager and Profiler were synced, the Replace Performance in #n button at the bottom right was greyed-out, which lets you know that the RM Performance matches the Performance saved on the Profiler.
Now in 3.4.32, the button is never greyed-out, even when I haven't made any changes. Makes me nervous that RM thinks its stored Performances are different from the Performances on my Profiler.