fujimoto hideaki? (artist)

is fujimoto_hideaki the same artist as Yonesuke?

Provide links, please.

They each have their own Twitter account, but I'm not sure if that's enough to go on.

fujimoto_hideaki's Twitter
yonesuke's Twitter

Well... that's because these two are the same:

post #841549
post #649193

Did somebody make a mistake somewhere?

I think it must have been a mistake. Looking at Fujimoto's Twitpic page and comparing it to yoneko's, the two seem to have a different art style.