German gun in gray and Soviet gun in green.
There are subtile differences in each part but the two kits are very similar.
Soviet version has simulated spoke wheels. Both are good sturdy wargame models, easy to build and look great. There is a tiny pin on the feet of the troops, it fits into a hole in the base. I stick the pin in the base, then cut it off. That fills the hole and I glue it from underneath. Then I mount the crew on sheet styrene.