These are Motion-based elevation graphs taken from competitors from the IMKY'07 race and the IMCdA'07 race (the new course). The total elevation gain is very similar - about 6,500 feet. These graphs are great in that the elevation scale is identical (each tick is 25 feet) and the distance is the same as well.
IMKY Bike Course Elevation:
IMCdA Bike Course Elevation:
The main difference I see is that in IMKY you have three 200' climbs in the first 25 miles or so. After that it looks like rollers...relentless, but rollers, with a great finish - that last 25 miles looks predominantly downhill.
CdA drops you off the 500 foot climb over 10 miles (that's a long climb...) for another chance to do it all over again - and it just looks like the climbs are a bit more pointy - longer and steeper. Granted, there are just as many downhills as up, so perhaps there is more chance to rest compared to IMKY. The ending of CdA is a nice downhill of about 15 miles.
Not having ridden either, I'd say that although the elevation change is almost identical, they are two very different, hard courses. Not that I'd take one over the other, and I'll bet that if you tackled one, you sure could feel good about tackling the other! What am I saying - I did take one over the other - I'm stuck with CdA!!!!!