But… the top Hufflepuff crest features an American badger, Taxidea taxus, while the newer crest features a European badger, Meles meles. Seeing as Hogwarts was founded in 1000 CE, before the official “discovery” of the Americas, let alone the American badger, the Pottermore crest is the more accurate of the two.
The movies used this one:
It depicts a European badger, suggesting that the books’ illustrator did not do much research on badgers, but as the franchise grew, the designers went ahead and looked into this sort of thing. Either that or fans complained about it.
Then again, the OP’s statement is probably based more on nostalgia than design choices, and nostalgia, nostalgia, and nostalgia makes my point a bit irrelevant.