Yeah Ezzy RDM has been made by No Limitz for a while. Even the boom adaptor has No Limitz written on it. Ezzy used to be made by Powerex, at least 5yrs+ ago now. They are very similar in curve etc.... on my Simmers, the Simmer mast is a rebadged Powerex which used to be the same as Ezzy and now Ezzy are No Limitz but are the same so they work well in Simmer. Clear as mud?

Anyway I can vouch for Ezzy / No Limitz / Powerex RDM's being a very "middle of the road" bend curve and working well on Ezzy, Simmer, Severne at least.
I don't know what KA recommend, but I'm pretty sure it is Powerex so an Ezzy should work well. Try and see I guess.
As to funny curves, yes Pryde and Gaastra were the worst offenders (now you can add Maui sails as the Spanier influence has moved over??). Having said that, I bashed NP for years about 'funny' bend curves but a 2003 5.3 Zone sets well on my Ezzy RDM...hmmmmm...
I'd say any "little brand" you'd be pretty safe on No Limitz / Powerex / Ezzy RDM's. Any "big" brand like Pryde, Gaastra, or Maui Sails, I'd rig it on your mast first and have at least 2 independent people (not the salesman( look and offer advice on how it looks.
Tip: if u have a NP, try Gun masts they use to be the same thing at $200 difference

Oh yeah and ferrule in the top section is supposed to be stronger... just about every wave mast ever made breaks in the bottom section, and usually near the ferrule. Go figure. I dunno why, but it seems to work for Ezzy / No Limitz.