Whats the difference Walboro WDA-1 vs WDA-31

hello all, The history is im restoring a pair of 1972 arctic cat 440 cheetahs. cheetah 1 ran great on the jack stand but after 2 trips on around the house while idling in the driveway, it sputtered and quit and wouldnt restart. looks like its flooding. The book says it should have the Walboro WDA-1 carb and I had ordered a rebuild kit in case it needed it. The machine had been sitting for 4-5 years and im thinking despite new filters and lines, something is plugged or stuck open in the carb. I made the mistake of not looking at the actual carb on the machine. The motor is the TIA440SIB from 72 BUT it has the WDA-31 carb on it which looks like they used starting in '73. wondering if the carb is the problem whether its working right or not? I have a WDA-1 from one of the boxes of stuff i got in one of the package deals I made for a different cheetah. Thinking I should rebuild that one with the kit and trying that.
What is the difference between the WDA-1 and the WDA-31?
Any info and experiences would be appreciated... Thanks!

Whats the difference Walboro WDA-1 vs WDA-31