I haven't knit with the LP Bulky but I've seen it and I would doubt they knit the same. the BIG WOOL is very round and thick.
According the WEBS site
RBW = 87 yards/100gm, 7.5-9 sts/4" on size15-19 needles
LPB = 125 yards/100gm, 3st/1" on size 10-1/2 needles