The 23.98 clips can be conformed to 25 easily in Cinema Tools. No render is necessary, though the audio will now be at the wrong sample rate and need to be rendered.
That said, if you have a fairly small amount of footage (because this process is SLOW) you can do a pretty decent quality frame rate conversion in compressor and not have to change the speed of your piece.
--
Jesse Rosen
Director of Technical Development
Abel Cine Tech, Inc.www.bustedskull.com