Any A2 chassis will be an adequate seat donor. Not sure about A3s.
If your car is a 2-door, the replacement seats will have to be from a
2-door, unless you plan on never using the back seats again. Also not sure if the Jetta *rear* seat is compatible with a Golf body. Wasn't sure if you were going to replace all the seats or just the fronts - I would probably want to do them all, myself.
Personally I would look for an A2 Golf with the interior you want and the same number of doors as your car so I could get the door panels and rear inner quarter panels (or rear door panels, as appropriate) so the whole interior would match.
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