Generally no, they are interchangeable. The only difference being that the 7800x3d is more powerful and gets hotter, so it requires better cooling. Apart from that you can combine things however you want.

For more actionable advice, we would need your budget and a list of requirements (gaming / streaming / video renders / etc)

I’m using feeder on android. It’s really simple, but has all the necessary features imo. It’s on f-droid and is getting updates.