I have only made a size compare, never bothered with checking with some hexedit...
One big reason reloadeds release is smaller is this:
on the disc there is a file named "padding.dat" (or similar, can't remember right now, gotta check it later) that is about 1gb large. It has nothing at all to do with the game. It was simply put there to slow down P2P distribution of any iso made.
Clones requires all files to be left on the CD/DVD in order to work. A cracked one does not require all files to be there/does not need protection files.
Reloaded has removed the .dat file and probably saved some space by removing space...
Reloaded also released a cracked version of Sniper Elite today, it uses Starforce 3.5...
Looks as if Starforce is finally getting taken down, it we get lucky distributors will see that and move to less destructive protections like Safedisc and SecuROM. I still purchase all games I play but I am happy as long as I can buy without starforce in them...