if I assemble a second Zynthian, with different hardware (less powerful PI) I have same questions:
Unrelated question: which is the origin of Zynthian name?
1 - I am pretty sure yes, though there might be incompatibilities with past versions, I would imagine. 2 - each one will have its own IP address, so as long as you know how to sort that out, yes. 3 - not much to suggest, other than, have fun :>
According to this blog, it would be the combination of ZynAddSubFX + Synthesizer + Debian