[cypher]

I would never try to judge on looks alone, hybrids can look like either species but that isn't a guarantee that they are purely one species or another, unless you've met the breeder, seen the parents & the pedigree I would never trust that you have a pure bred hamster.
It seems highly dubious that anyone selling much sort after pure WW would be selling them to a garden centre & as you have one at least that is a hybrid then that surely raises doubts that you can take the word of the garden centre in regard to any of their hamsters.
If you really want to breed WW & it certainly sounds as though you want to try & do it properly then I would recommend going to hamster shows, meeting other breeders & finding some true pure bred hamsters, there's a lot to learn before you even begin.
I would wait & learn & not take any risks with the hamsters you have.