I think the principal difference is that, resource priorities aside, the USN wouldn't have ended up building the Montanas anyway, because by then they'd recognized that battleships were over.* Given enough time to reflect, it's conceivable that the IJN's leadership would have reached the same conclusion, although it would have been very difficult for them to accept. They'd already taken a step or two in that direction by finishing Shinano as a carrier, though.

The Germans, on the other hand, still would've built H-44 if they could have, regardless—and then whined to the devs about Airplanes OP Pls Nerf when the 8th Air Force bombed it like Berlin. (Sure, they'd have had to drop enough bombs to level Silesia in order for enough to hit the ship to do it in, but you know, by '44-'45, the 8th was up for that.)

--G.
* To paraphrase Dinah Washington, battleships were great, now they're outta date, and CVs are the thing this year.
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Benjamin D. Hutchins, Co-Founder, Editor-in-Chief, & Forum Mod
Eyrie Productions, Unlimited http://www.eyrie-productions.com/
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Ceterum censeo Carthaginem esse delendam.