I did a bit more digging and the reason the CRCs are different is because they have different 'root blocks'. Specifically, the timestamps are differrent.
For example, for disk four:
IPF Image:
Created: Wed Mar 13 14:59:10 1991
Last altered: Wed Mar 13 15:01:56 1991
SCP Dump:
Created: Fri Mar 22 16:36:06 1991
Last altered: Fri Mar 22 16:38:52 1991
I don't know why my physical disks sets have the same timestamps but are different from the original IPF sets.
I'd be interested in other peoples disks sets dumps and what CRC and timestamps they have.
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