Thanks for going to the trouble of measuring & taking pics.
The mirror part seems identical (well, the main case is two parts instead of one, which is much nicer IMO but some celicas are like this too so it's just a model variation thing). But, unfortunately, the part that connects to the body is quite different. The xA6xs have a much larger part in front of the mirror that becomes part of the door.
Good luck with the sale. Amazing car btw, don't sell it if you'll regret it.