I've tried all the Pin Kaow locations and they're not the same as the original on Rainbow and Lake Mead. Back about 18 yrs ago there wasn't much asian food options in Vegas. You may find a few tucked inside strip malls or by grocery stores.
Well this one was in a strip type plaza, very small maybe sat 20 or so people but it was the best Thai food in that side of town (Summerlin area? it wasn't called anything then. )