The taller tank is going to fall under the 2x2 rule. So it does not need a hydrotest. As shown, it also has an older Ambush reg, which was most likely made here in the US. Before Dan partnered with YSN.
And speaking of YSN, as of a bit over a year ago, when YSN decided to remove the old guard GA staff, no one there, not even now that TA owns GA, will know much, if anything, about the older GA stuff. You would need to contact Dan Colby himself.