No, you should be ok. I would recommend updating your recovery to the newer Clockwork 2.6 (or even better, Amon 2.3) using ROM Manager. Unless you feel comfortable flashing the PC36IMG.zip of the recovery you choose.
These updated recoveries back up your wimax keys should you ever lose them. You most likely wont by just doing a simple reflash, but i would go ahead and back them up now while you can..
I would:
-Flash updated recovery (or Amon 2.3

)
-Boot into recovery, and make a nandroid backup.... In amon, be sure to check cache, recovery, and wimax, then click perform backup.
-Wipe Cache and Dalvik Cache. (I do not know if it is recommended to wipe Data for upgrading that rom, you will have to make sure)
-Flash your updated version of the Rom.
It will take a minute or two to boot up a rom for the first time after you wipe Cache and Dalvik, so that will be normal.
Edit: You beat me to it! Also great advice.
OP... You can see the pattern here... Amon
