I cannot find a Takeda kiritsuke on CKTG's website to make sure what I'm about to say is accurate, but:
I wouldn't be as worried about the extra 30mm in length so much as I could about the overall size of the blade. Takeda's knives are wide, and a kiritsuke doesn't really taper to a point like a gyuto does so a Takeda kiritsuke would likely be wide from heel to just short of the tip making for a very large profile. Not sure if that helps decide, but it's my $0.02.
Yes, you'll find $100 difference between a Takeda and Moritaka.