H'm. My understanding is the 0939 is the date code. But we see the tallter, square cut vent tubes in this one.
View attachment 1715994976
The other has the shorter slash cut tubes that are common on the -3.
The vacuum pod top is different on the other one as well.
I don't think it matters you could use either use either one. IIRC no -2 came with a secondary block so those were added.
If it was me I'd map both out to know what I had. If/when you open them, feel free to ping me.
An unmolested early 3310 should be fine. IMO better than most carbs sold in the past decade or so.