I was looking at those, too. I see that this seller doesn't offer many details.
Those kits look rough, and I'd expect mismatched parts. His Type 2 kits, at least, have incorrect, Type 3 buttstocks. He doesn't show the socket-type rear receiver section in his auction.
The Type 2 and Type 3 butts are not interchangeable. These are mine.
The toe of the Type 2 drops much more and the buttplates are different.
My Type 2 has had a common field modification made to it. Someone moved the sling swivel to the left side, but I moved it back. The Type 2 has a sling swivel on the bottom, while the Type 3 has one on the left, rear side of the receiver. Stock tangs are different, too.
I think he's been trying to sell these for a while. If he were to be more forthcoming with his descriptions, he might sell those kits for what he's asking.