I've heard of people combining different pictures from different scope/camera combinations. Never understood myself how it's done!
There's a guy in South Australia who does it with twin RASAs, but that's an identical image train which is what I'd do if given the chance (not necessarily the RASAs, but just having two of everything).
That said, to answer your question, my longer exposures are all with the same setup. We just have to wait for those clear nights and hope we can get something in that time.
Good thing is we can always come back to the same spot, and with platesolving and rotation, we can exactly match previous compositions. I did this last night using a different camera (same sensor) on a different night and had NINA tell me how much to rotate the camera so it matched previous shots.
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