Not as far as i know, maybe via a retro fit performance company that was accredited to Ford RS.
MK 2 Mexico's were a bit of a sales gimmick, generally came with a 2.0L (over the standard 1.6 L), performance carb, different cam, and slightly uprated gearbox ratios and a so-called sport rated suspension/brakes. The rest was purely cosmetic...
The RS 1600 on the other hand was a pure twin cam thoroughbred, where very few of the main mechanical components were anywhere near standard and why final build work was carried out at the Aveley RS factory in Essex.