So, I had the same question. Mine was referencing the 23b floor plan, but here is what I found. The Kiwi line was the original hybrid line, and it seems there was a lawsuit reference the name. Which led Jayco to change the name to Jay Feather, which is why the Jay feather's are newer, I think 2003 was the last year the Kiwi name was used. So they are basically the same, although the Jay Feather line does have different models, ie. LGT, EXP, Sport, Baja.
2006 Jay feather X23B EXP
2006 Dodge Ram Hemi 1500 quad cab