mescheryackov.paw ,
The difference in the frequencies supported:
* Huawei B310s-927: B1 / B3 / B8 / B40
* Huawei B310As-852: B3 / B7 / B8 / B38 / B39 / B40 / B41
* Huawei B310s-22: B1 / B3 / B7 / B8 / B20
* Huawei B310s-518: B1 / B2 / B4 / B5 / B7 / B28
As far as I know, the Russian operators, mainly working on the range B3, B7, B20. As seen from this point of view modification V310s-22 is the most versatile.