exobook, I see tons of differences between the WOT screenshot you posted and the tank used in the video. Is this the actual in-game model, or maybe a higher-res version of it? Most obvious differences are the PT one has a shiny texture, and lots of little details like the bungee cord and the shovel are either missing or else baked into the texture rather than built as part of the mesh. In particular the turret has a curve to it in PT whereas it's flat in WOT. If you can customize the rustyness, choose a different turret part, and adjust level-of-detail settings in WOT, then these differences may not mean anything. I'd like more information.
Thyunda gives a much better example. I couldn't spot any obvious differences between the PT and WOT versions of the Pz.Kpfw. II mesh, just minor texture variations. That said, the PT screenshot was too low-resolution for me to eyeball whether or not curves used the same number of polygons or had edges in simmilar places.
Interesting enough, one obvious distinction on both tanks is the texture on... I don't know the name for it... the cylinder that allows the gun to aim up and down. They made that texture different in both games.
I just thought of this, but if anyone can extract the textures from both games, an identical UV-layout would probably be the most obvious sign that it's the same mesh. Short of just extracting both the meshes, of course.