It is good to see a collector from Bulgarian here. This is one of my favorite current camouflage uniforms! And until now I did not know there were two types of trousers. This is good information to have because this means the "commercial" trousers I have are actually real issued trousers.
There are two slight variations of the shirts. One has velcro for the national badge over the left breast pocket, the second type is sewn directly onto it.
The parkas came in two very different versions. I forget which is which, but one has a liner with the collar attached and the other has a liner without collar (the collar attaches to the jacket). There are other slight differences beyond the collar. I know this is true for the desert uniform, but I do not know if it is true for Temperate (green) and Air Force (gray).