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For the 24 port models, yes the switch's fabric is "overkill", but it's "just right" for the 48 port models.
My guess would be, Cisco uses the same fabric for both the 24 and 48 ports models, but the 24 port models will have 48 Gbps of fabric capacity they won't use. The only downside, in theory, is you might be able to built the 24 port models for a little less if they had only their required fabric capacity, but maybe not if you're going to have both models.
For all we know, like CPU and RAM chip makers, perhaps 24 port models use a "univeral" 2960X fabric, but it didn't pass some tests for supporting the 48 gig edge ports.
