Hi,
Is it possible to dual boot if I install an earlier Linux system after Karmic Koala has been already installed?

I tried however after installing the second linux (one that is earlier than Jaunty Jackalope) I had only the earlier version show up in grub at startup.
If I do the reverse and load Karmic Koala last both O/S are in grub.
I believe karmic Koala has a newer version of grub, would this be the cause of this and is there a way around it?