How can I tell if this seed is a photoperiod or auto?

I bought 3 autoflowering feminized Lemon Haze seeds from Seed supreme (seeds are from Emerald triangle) and they threw in a free seed. All I know about the free seed is that they wrote "blueberry" on the little bag, and their customer support cannot tell me more since it was a freebie.

One of my lemon hazes germinated the day after the blueberry and it is already starting to flower at 3 weeks under 20/4 lights (as the website suggested) whereas the blueberry is bigger, fuller, but has no sex traits yet whatsoever, and the only blueberry autoflowering strain listed on the seed supreme website has a shorter time to flower than the Lemon Haze I bought.

This makes me think it's a photoperiod plant. Is this a good assumption?

My current plan is to let it really get nice and fluffy while my other 3 lemon hazes completely finish and flower, then switch my lights to 12/12, hope the blueberry is a female, and if so, I can make clones and finish her up, but that will take a bit of time while the lemon hazes work their way through.

Welp, apparently their customer support *was* able to tell me. It's a photoperiod blueberry by Dutch Passion. anyone grown this strain before?

well you could always pop it and throw it under 18/6 light schedule, if they were wrong its genetics wont lie to ya!

You'll know if it's an auto when it starts flowering while you're still vegging