Yes, it would weigh less. I suspect it would also change color. But I don't know what THH acetate looks like. I know THH HCl is sort of white with a greenish or straw colored tint. THH citrate is also the same color, so I assume THH acetate is the same. I suspect that freebase THH would be whiter.
My guess is that, like THH HCl, THH acetate can also be smoked as is. Several trustable people claim that THH HCl can be smoked. SWIM has not tried it but it probably works. If it works for THH HCl I would assume it would also work with THH acetate. Why not try adding a few drops to some herb, letting it dry, and then smoking to see if that works. I bet it does. I believe THH is active at about 10 mg when smoked.
You may remember me as 69Ron. I was suspended years ago for selling bunk products under false pretenses. I try to sneak back from time to time under different names, but unfortunately, the moderators of the DMT-Nexus are infinitely smarter than I am.
If you see me at the waterpark, please say hello. I'll be the delusional 50 something in the American flag Speedo, oiling up his monster guns while responding to imaginary requests for selfies from invisible teenage girls.