How would a modernised N3 compare with Yamato?

How would a modernised N3 fare against Yamato?

It would be slower but heavily protected and powerfully armed. Building N3s could also have prompted a different Japanese design.

A modernised N3 would be slower than Yamato but would combine very heavy armour with nine 18-inch guns. Four completed N3s would also change the requirements facing Japanese designers. A Japanese response with even larger guns is suggested as a possibility, without a definite design being established. The American problem is framed differently: the industrial ability to build a counterpart is distinguished from whether Congress would fund it. The scenario cannot assume that historical Yamato would remain unchanged after a British N3 programme.