Wing mirrors, electric fail

I changed the O/S mirror on my 2004 ZTT with a donor Mk1, on adjusting it blew the fuse straight away.



Tonight following stripping the door again I noticed the wiring is different on this mirror to the loom, foolishly I assumed Rover would be standardised.



For now I have disconnected the plug on the mirror, but the passenger one fails to adjust now, have I damaged a circuit?



Any advise welcome please! Thanks

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