I need help determining whether they're the same artist or is this a plagiarism case.
http://blog.acgarts.com (circle blog, has multiple artists)
Both are Chinese, same age and gender, nickname are Masara in a way (マサラちやん vs Masara_阿飘) but different blood type (A vs B). Notably, the former pixiv account has picture titles, artist's commentary and tags in Japanese, while the latter are all in Chinese. The former also has self introduction in the profile in Japanese, the latter doesn't say anything. All these details might indicate sixi1990/Masara_阿飘 doesn't know Japanese.
But I'm not entirely sure this is plagiarism because all of the latter's arts appeared to be a little bit fuller (albeit smaller resolution) compared to the former's:
post #892707 vs illust #25813733&page=2
post #896434 vs post #1383516
Updated by henmere