very common trait of skunk #1 genetics to run....smaller....and darker...
you probably won't know much until you grow them out. only really small dark seeds i've had were for sam skunkman's original haze x skunk #1 and that's sativa dom as far as i know, not indica. growing them out will give you a much better idea of subspecies dominance all the best
all my sativa have tiny tiny beans like really small when i get sent indica beans i always think 'fuck' cos they are soooo big, also i find with my sativa beans they never look ripe always green