After opening 5 bakusteel starters It seems that the Q series is actually 2 sets of cards. 1 for the B3 series and 1 for the New Vestroia BakuSteel series. 1/48q Clean Woods (Grey Gatecard) from NV BakuSteel has a code BA583-GA-SM-GBL1/48q Deep Roots (Grey Gatecard) from B3 Series has a code BA631-GA-SM-GBL631 - 583 = 48 so this will prove that Q series is actually composed of 2 sets.
I just bought a original BakuSteel, not B3, Starter, and it came with the Reuse Gate card which I also got from a B3 booster or starter, of which I don't remember what the Bakugan was exactly but aside from that. That shows that it might not be 2 different sets for the Q series.