Could I get the initrd.img file without recompile the kernel?

Hi, all:

The vmlinuz-3.0.4.old is a kernel previous to the current running kernel vmlinuz-3.0.4 which is compiled the most currently. Could I get the initrd.img-3.0.4.old without recompile under the condition that the config-3.0.4.old, System.map-3.0.4.old and vmlinuz-3.0.4.old exist? if it can, what and how should I do?

thanks!
li,kunlun

Is there even any difference between the two? It's the same revision of the kernel...

You can put anything you want in an initrd. Whether they're different or not, and what gets put in it, and what you need to build it, depends entirely on how they were created.