Я читал что сам Амазон не выключает при смене типа в рамках одного и того же тима m5 на m5
Resizing an Amazon EBS–backed Instance
You must stop your Amazon EBS–backed instance before you can change its instance type. When you stop and start an instance, be aware of the following:
We move the instance to new hardware; however, the instance ID does not change.
If your instance has a public IPv4 address, we release the address and give it a new public IPv4 address. The instance retains its private IPv4 addresses, any Elastic IP addresses, and any IPv6 addresses