that car in the first pic is definitely a xr4ti, not a genuine cossie.
the true giveaway is the tag lights on either side of the license plate.
if the picture was better you could tell if the brake conversion was from a sierra cossie or if it was the pbr front brakes and turbo coupe rear brakes.
the second giveaway is the exhaust pipe. i have never seen an after market cossie exhaust that didn't have the muffler all the way at the rear of the car, such as the mongoose exhaust on my moonstone blue cossie that hackbar posted earlier. of course that could have been a custom exhaust fabbed up for the car, which it would of had to have been anyway since it is a merkur. if you could see the other side of the car you'd see the gas door too. which is another true giveaway of a clone vs a genuine cossie.
as for the big windows and lack of the c pillar, well that's a common body mod nowadays.
here's one from a xr4ti that got the full cossie awd train.
that's not even considered a lot of work in my circles. however, splicing a subaru brat onto the back of a xr4ti is bit more work.
here's the backs of the two cars together.
the other giveaway is that the lip of the spoiler is shiny black like the rest of the car. all genuine cossies had a flat black lip on the spoiler.