Hyper-V offline migration between AMD and Intel Processors
You should not experience any problems moving between different processor types in a scenario where you stop and start the VM. (Such as an export and import.)
If these are cluster nodes and the cluster nodes had different types of processors in them, and you wanted to move (but still not live migrate) the VM from one node to the other, you'd need to boot the VM in "Processor Compatibility" mode.
But despite what it sounds like, "Processor Compatibility" mode still will not allow you to live migrate across machines with different processor types.