Technically speaking, could I take the neck off my Squier, and put it on another Squier, with out changing anything set-up wise?
Or is there more work to it than just switching the necks?
That would be true assuming that (a) the neck pocket is the same shape and (b) the scale length is the same.
^ Yupp.

Thats all there is to it, if everything matches up.

If they are the same guitar, then you should be all G.
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You'd probably want to adjust the truss rod and all that, but yeah it'd be fine.
Nope, no sig here.
Any other squire neck should fit as Ive never seen anything but 25.5 scale squires. Other fender necks should drop in to. I put a 24.75 scale warmoth in mine with no issues.