um well i would say that they are pachanoi it's hard to tell because there so small (never started from seed before but just ordered 100 bridgessi yesterday
) but i think they have to many ribs to be bridgessi. some pachanois do get longer spines but i think it will even out as they get bigger. I like to use cactus mix this one in paticulat lol and mix sand into it for better drainage. sand might defenantly be a good idea when there so small IMOP, easier for the roots to make there way.
what ever you do good luck give them much love and love you shall recieve.