Should I be illegal?

[Sporlo]

To anyone who knows about the software of large companies (but mostly Mac users):

Do you advise me to copy iLife '09 apps onto another computer with iLife '08 and possibly the G5 with iLife '05?

I own the iLife '09 apps which came with the new laptop.
I don't think anything will happen really, but I just want to know if anyone knows something I don't, like if any adverse effects are even remotely likely to happen.
I've already put an iMovie '08 on the G5, and nothing happened, so I might do with the '09 stuff.
I just don't want anything to just stop working because I moved it, etc. etc.

[Lonestar]

I've moved the iMovie 06 app to computers that came with newer versions and it just worked, but I don't know if it'd work if you move newer applications to computers with older versions installed, or if it would work for the entire suite. You might as well give it a try, but I wouldn't delete the original iLife programs on those computers in case something doesn't work.