A dump question: Do I (and others) have to download the ingame version, too or will the caw plants be exported with the world?
You should actually be able to even chuck the CAW versions into your 'regular game' folder as near as I can tell, and they'll work there too for you, without you grabbing the 'normal'. (Not 100% on this, I should test it I suppose..)
However, the players who download your worlds will just need Porkypine's originals, not these edited ones.
Editing to clarify- You do need either these or the originals in your game mods to have things show up outside of CAW.
To clarify, if you put these versions that Bakafox made into your Game Mods folder, they will also show up in the world editor catalog. That means you will be able to add them to your world (outside of lots) in-game.