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Not really. A 25-footer would be a MUCH larger boat overall -- beamier, more draft, more hull length and volume. Probably 40-50% more displacement than a 22WD. (EDIT: I just checked the listed specs of the 25 v. 22 here on Whaler Central, which show the dry weight of the 25 is indeed more than 50% greater than that of the 22.)

The WD primarily only extends the length overall measurement. That is not a good metric for judging boat size. Displacement (or weight) is the primary indicator of size. And the WD only increases the vessel displacement a modest amount.

Just to be clear, I do not doubt the HP requirements of the 22 WD. I'm just surprised how high they are.