problem is that there is a legal issue using JA textures for JO. You can import JO textures to JA but not vise versa.
you can find that info at www.map-craft.com
Personally, I don't think many people will take much notice to it unless you are submitting the map to jk2files and the approver does not approve adding your map to the JK2 section because of it. Other than that I say use 'em. lol