RE: Chip Hyde Extra and Planes plus Extra. Same planes?
Looks to me like Planes Plus may be taking the CA Model's Extra from kit or ARC form and finishing them to a higher level of completion--they all have that CA trademark of a huge vertical stab...
Note that both CA kits/ARCS and the Planes Plus ARFs come in 24%, 27%, 34%, and 38% increments.
Coincidence? Nah....doubt it.
The Chip Hyde plane costs more because it comes with a Chip Hyde decal.