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thanks @gbj_tester and @M_V - yes I do normally enter them in (or verify that what is in there matches the manufacturer site, as I can't easily take some of the measurements by hand to .1mm accuracy), I just hadn't clocked that the centre to flange measurement (which is actually printed on the hub!) is the bit that would be affected by it being a wider OLN.
Not sure if I can be bothered to build up the wheel though as I don't even have a frame that can accommodate boost 148!
Tester says can, I’d say should.
Trusting the dimensions that are in spke calc databases is a good way to find yourself with a collection of spokes that don’t fit.