I don't think that anyone other than someone that is well versed in these trucks would catch the diff, & even then, that's probably minimal & would be pretty hard to notice, even to the trained/knowledgeable eye.
If you're really concerned, then maybe order up the other side from R/A.
You could recoup that cost by selling the non-matching one.
There is a market for them, I guess.
I'm not a fan. Had a set on my '98 for less than a week. Have to have you're head on a swivel in rush-hour traffic because, well, let's just say that I didn't find them to be all that 'efficient'.
Traded mine straight up for a set of the Street Scene mirrors. One of the best looking mirrors ever designed for these trucks, IMO.