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On closer inspection, I have now formed the opinion that a previous owner has replaced the screws holding the mirror cell as they are button head whereas the ones holding the corrector cell are pan head. There are also some marks/scratches around the screws on the mirror cell that might be from a previous screw removal attempt.
I'm not sure if they are the same thread at this stage however my plan is to replace them all. The ones on the mirror cell seem to be 8-32 UNC.
If anyone has the measurements of the original SN10 mirror cell retaining bolts handy I'd really appreciate confirmation of the thread/bolt size.
Here's a couple of pictures - first is the corrector cell with what I believe is the original bolts and the second is the mirror cell with the new bolts.
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