Straight swap.
I bought some m100 lights from a US car so had to swap the internal indicator lens from red to amber..bit delicate..some risk of snapping...but for UK lights all ok.
On the elan the lights are recessed behind trim on the top wing corner...so there may be some slight abrasion from rubbing which would be visible on a GTA...if you are being picky. You may see an arc over the corner where the light was behind the trim. Added a photo ...blue circle...
In general the shade of the lights can vary..so if buying odd they may not match..some are rosier than others..but some folk here have received tinted to match.