I wouldn't jump in here but this is a safety issue. It is a myth that the CZ-52 is stronger than the Tokarev. A fellow by the name of Clark Magnuson did some research in this area. In addition, after blowing up two CZ-52's himself he discovered the the area of the barrel under the rolling blocks is exceedingly thin and leads to catastrophic crack propagation and barrel failure with heavy loads. The Tokarev has a thicker barrel and can sustain higher pressures. If you read through the thread linked below to his post you will find a number of references and a description of his personal experience.
I don’t know for sure but I still think the CZ is stronger. According to the article the Tokarev ammo is 20% hotter than the .30 Mauser and the CZ ammo the Czechs used was 20% hotter still.
If their military was using that ammo, the guns obviously withstood it.