Matt, VideoTrack,
Thank you!
Yes, now I see what you are saying about impossibility of instance to instance copy.
I had 2 instances opened and had items "copied to clip board" in both and since arrangement was very similar, I thought I was copying from one instance to another smile LOL!

But the drum part of the issue is happening regardless, and it seems started when I did this: Opened arrangement, copied chords (select / copy). Opened another arrangement, pasted.

Real Drums would not change when selecting one from the picker, but for example "loops" would load on that track, still showing previously selected Real Drums NAME... Does not make any sense.

I overcame this by switching Bass and Drums tracks around. Then I was able to change out Real Drums. Still some sections of tracks had strange behavior, almost like a track was "frozen" in some way with another set of chords and bar changes So my question is slightly changed but remains unsolved:

How do I copy and paste only chords+bar changes from one arrangement to another nothing else that might interfere or cause issues as described above?

BTW, if we had more tracks available in mixer, this would be a non issue smile