The only difference is that the CTR/'01 ITR intake cam has 3 degrees more duration. Nothing major really, they both produce about the same results on a dyno.

The thing is, I just checked the dealer parts catalog at www.acuraautomotiveparts.org and the '01 and '97 ITR intake cams are the same part number. So hmm. I would just buy the set from them anyway, it's only $450 for both. The extra $100 or so per cam that most JDM shops will charge you for the CTR cams isn't worth the extra 3 degrees of duration.