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He probably can't use a 2.6 kernel easily. RedHat9 is ancient if my memory serves correctly. Still 2.4 is in good shape, and the last update is from 1st of February (188.8.131.52).
Relating to the original question, we can't be sure about these files. But yeah, those file names match those usually used for kernel images. The numbers are the kernel version. "vmlinuz" alone might be a symlink (usually to the latest kernel you installed). You can check more details about the files by going into /boot and using "ls -l vmlinuz*"
As i92guboj said, "ls -l /boot/vmlinux*" will give you some information on the files like if one is a link to the other and if not you can see if they are the same size. Also, you can try "file /boot/vmlinux" to make sure that they are kernel files and a little more information.