The 91A both have the needle valve built into the carb.
The 91AII has a remote needle valve.

The one for $130 dollars very likely has a ASP on the side or the crankcase whereas the $103 dollar one is generic with no ASP logo on the side of the crankcase. It could also have been a earlier version which was sold at the higher price before the generic price reduced models came in.

They come in a plain white box with no instructions. But one does not really need instructions if they have some experience running glow engines.
At these prices there is little to no support and no parts.