It doesn't really make a huge amount of sense referring to an exact version. There are going to be kernel updates even within the lifespan of a minor version release of Redhat, e.g. 5.6 to 5.7 and even going to 5.7 there's no actual tangible difference to the kernel at that point in time compared to the first 5.7 update and the previous final 5.6 one, it's just a baselining of updates.
But certainly every kernel package was released during a specific minor version being available. you can look at a mirror http://mirror.centos.org/centos/
to see the exact packages per minor version if you really want, that'll help you dervie a matching up process if you need one for some reason. But note still that if you install rhel 5.2 and run a "yum update" this morning, once it's all finished you'll then be running 5.9, like it or not.