pioneer deh series faceplates.

I'm wondering if the differences amongst the Pioneer DEH series are in the faceplate? For example the DEH-14UB and DEH-24UB. The 24 has iPod control, the 14 doesn't. Is the difference in the unit itself or in the faceplate? My DEH-14UB isn't reading ID3 tags from songs on a CD-RW but it does from the exact same files put on a USB stick. It also doesn't appear to have illumination color changeability. (Any color you want as long as it's red! Red? That's sooo 80's. Or is it 'Euro'?) If swapping the face from a higher model will 'convert' it to the higher model...

no, it doesnt work that way. but it would be nice