User blog comment:Kogath/Monster Hunter 4 Ultimate for the Nintendo 3DS/@comment-5716529-20141226062808/@comment-1011548-20141231121143

"We changed it because I talked to the director about a suspicion I had, which he confirmed."

I was about to suggest if they've all got the same name, maybe they're actually all the same species, just, I dunno, different stages in the life-cycle. Then I remembered Crimson summons meteors and White summons lightning, so it's probably not too likely...