Are you sure? I have an 34C HD and KcG, and KcG is a way better than 34C HD for me. It is definitelly not the same head as Merkur.The KCG is not an r89 but a merkur style head. Heritage is an r89.
Afaik, Merkur has the same head+ baseplate on all safety bar 2 or 3 piece razors.
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