The name on the image is "chize" and the twitter's display name also "chize",
but artist tag for chize in Danbooru seems like a different person.

Cassava said:

The name on the image is "chize" and the twitter's display name also "chize",
but artist tag for chize in Danbooru seems like a different person.

It's the same chize. They have two twitter accounts and three websites, but following the links leads to the same Pixiv.