In the 15 yrs I've grown autos, I can count on one hand the strains that were pretty much duplicates of one another...dinafem white widow xxl and short stuff purple gorilla come to mind and were all pretty much rubber stamped 'classic' auto style plants.
I do a lot of plant moving from one light system to another and often notice subtle changes according to lighting. My blurple/hps grow seems to more foliage and with the cobs/qb grow, firmer buds so yes lighting does make a difference. Pics every 2-3 days helps ya duplicate efforts.