Yes, it will help us figure out what's going on to know the model Canon camcorder you used. Did you Log & Transfer all the clips yourself from both of these two camcorders?
Things just don't sound right. Rendering should not take 9 hours if your clip & sequence settings match. Unless you added lots of effects that require rendering, and even then 9 hours sounds way too long.
What model Mac are you using, how much RAM does it have, what is the size & amount of free space on your hard drive? What version of FCE are you using?