Checking a few references, other than the facts that the VIIC was a bit longer, a bit slower and drew a bit more water (all previously mentioned); the two types appear identical. One reference stated that the VIIC had 50m more diving depth, but diving depth is not commonly referenced so I don't know if that is correct. In-game both seem to have a max safe depth of 150m. One reference seemed to suggest that political or ease-of-construction factors may have been the reason for the focus on the VIIC.
I suspect that in the design work that added the extra 1.5m, some simplification for construction work was also done.
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