The gray restore DVDs are machine and model specific, so you can't use restore DVDs from one Mac with another, except if they are the same model, as in MacBook Pro 5,1 and MacBook Pro 5,1, but not with a MacBook Pro 5,2 and MacBook Pro 5,3.
MRoogle would have told you that.
Also one can't install an OS on a Mac prior to the one that came with the Mac, so no 10.6.2 on a Mac that came with 10.6.3.
And yes, the new MacBook Pros are supported by Mac OS X 10.6.3, they even come with it pre-installed.