The purpose of this page is to give the community a listing of comparisons showing how well the vehicle from manufacturer pair up to other manufactures.
StuG III G (Battlefront, PSC, and Old Glory)
Sherman Tanks Various models of Sherman tanks. While not a specific model comparison it can at least give you an idea how well they fit together. Will try to update specific models at a later date.
SdKfz 251C (link to the excellent Spotting Round comparison)