Sexing help? (Didn't want to post in someone elses thread)

[rattus knits]

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Left pic: My smaller garter
Right pick both garters, one of left in this pic is my larger

The are most likely not the same age, got them from a friend who couldn't care for them any more, she didn't ask the shop/breeder any questions other than basic care so little info on these guys

Both are common garters (eastern garters?)

Thanks!

[Mommy2many]

I'm going to make an educated guess here but I'd say female on the left, male on the right. Anybody else want to chime in? And they are holding tails...