A 1.6 sport is what it says on the tin, they are a 1.6 carb with slightly sporty seats and they came with the same wheel trims as some of the xr2i did.
The RS TURBO is a totally different car mate, sorry to tell you but if you have bought a converted 1.6 thinking it a genuine rs turbo you have been well and truely done why did'nt you check all the numbers when you bought it?? it the first and most important job you do.

The previous owner should have informed you of this if they were a genuine seller.