I was able to do some research and according to the manufacturer's data, this is another variant of the B850 chipset. As a rule, mainboards with a B850M chipset have fewer PCIe connections, PCIe 4.0 instead of 5.0 and fewer USB ports. However, there are exceptions such as this motherboard with PCIe 5.0 support. You can therefore choose one of the two, depending on the motherboard.