Blackberry strain tester x 2

So I have 1 blackberry Fast buds seed as a gift pack and I had 7 blackberry kush Dutch passion. As I grow in sets of 2 I thought it would be a cool way to compare the seeds side by side. So they were both in water for 18 hours and then paper towel. They both crack after day one and the both of them got 2cm tap root in 3 days. So far they are identical for growth. It will be interesting to see when they really start growing as fast buds says about 8 weeks and Dutch passion says about 10 weeks.