It doesn't really matter if it's disordered eating or not. The main difference between the two of them (and why they're incomparable imo) is that beyond body checking occasionally, Eugenia never outwardly disclosed her eating behaviors. She never made it an aspect of her content (others did, but that's besides the point). Whatever she did, whatever demons she faced, she faced alone and didn't knowingly/intentionally drag anyone with her. Since she never addressed it, it wasn't really her responsibility to update her viewers on it.
Amber made her entire channel about her "disorder," made multiple videos about it, sucked everyone in emotionally, but doesn't take steps on her own to help her situation or even update people on the things she constantly mopes about. She takes advantage of the label and loves the merit she's given from victimhood. She doesn't want to get better because she'll lose what makes her special, unique, worth watching, whatever. She's just some bland, housebound chick who doesn't have any talent other than shuffling cards. Eugenia has her quirky interests that shine through, so regardless of her size, she's enjoyable to some.
Basically, AL uses the label as a tool, Eugenia did not.