This will help you compare the different models.
The Colt Mk1 is the standard model since 1978. Note the 13inch wheels. Tara weight is 600kg !
The Colt Mk2 (trailer in the middle) has the same dimensions, only with a new front look, 14 inch rims and tires, and many extras available.
The Export 2013 has the same dimensions than the Exports built from 1980. Only bigger wheels and modern components.