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One difference is the 451 cylinder has the coil mount built into. The coil for the 50 is the the recoil cover.
But do they all? One version of the 451 had the coil in the sparkplug boot same as the 910....but that cyl was probably the one fitted for the Nordfeller attachment. But I can't say for sure without diving into the 451 boxes.....but I tend to agree with you and Niko... I believe a totally different P&C sets for both the 451 and 50.