AFAIK the a-b-c enumeration comes from hardware, so for example whichever sata port you use in a motherboard would always get the same identifier. You'd need to turn off all four nodes and check the disks are indeed connected in exactly the same ports. If that fails, then I'd assume the motherboards are from different batched or soldered differently for whatever reasons.

How about using labels in etc-fstab ? That should be all you really need to be able to refer to disks in a cohesive fashion between nodes.

@anzo@programming.dev is correct, it's the order you connected them in (see tldp). Use UUIDs or devices lables for consistency or connect them in the order you want.

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