I have a M20S and a M31S+ that have two different power supplies.  The M20S is starting to hash erratically and I'm wondering if it's a PSU issue.  Can I just swap the PSU from one to another?  I looked on Whatsminer website and it seem like they have several models.  Can someone educate me if these are all compatible?  I do see some differences such as 16A max, 20A max, 277v, etc...  Other than that are they cross compatible?  My input power is 240V and each ASIC is on a dedicated 20A circuit.