User blog comment:Swordweaver/Kaga's sister ship, Tosa/@comment-27111066-20160124032343/@comment-26107364-20160203133331

Yeah, in most English sources, it is listed as Tosa class, but on the Japanese wikipedia (yeah, ok, so maybe not the best source, but I'm not claiming to be an expert) it's the Kaga-class. And, yeah it would be kind of silly to have the nameship of a BB class be a CV (Kinda the reverse situation w/ Shinano)...

I just wanted to go with this because Kaga has appeared first in Kancolle, and they are sister ships, and figured Japanese sources would take precidence.

Apparently Atago-Takao have a similar naming dispute (see: World of Warships), and Littorio-class is called Vittorio Veneto-class in Kancolle too