First off, you asked about the deck, everything I said there was true about it. And yes the "chimney"(although the top section and shaft may also be called chimney so i reffer to the liquid feed portion as a barrel/sleeve because it looks like one) has the liquid feed holes now rather than the base, and as for the air flow....I think the center screw is the same size but not 100% sure.
You tell me if you see any difference
You keep saying deck, do you mean rba section? As a whole?
In that order: chimney, barrel (sleeve) and the deck