Yet another "is this a winter white" question.

[Newbiehammiemom]

Hi all.
Newbie owner....covid quarantine and 2 kids at home for 70+days so I gave in and a few weeks ago got 3 hamsters. 2 are robo sisters (don't judge...we bought them all from a local pet shop) who share a cage and 1..what I think is a winter white or could be hybrid. She is sold in CZ where I live as simply *dzungarsky* so it's not clear if she's campbell or winter white. I went on google and looked at stuff like her dorsal stripe etc but I wanted some community and expert advice.