Different OS on back-up and computer

I have a laptop that is running Leopard. I also have a bootable external HD with Tiger on it and a lot of data in classic mode that I need to be able to access. Can I boot up my laptop using that HD or must I go back to Tiger on my laptop as well? This is a secondary computer - my main computer is an iMac running Snow Leopard.
If I do need to go back to Tiger on my laptop, how do I do that? I do have the original Tiger disk that I purchased when it was first released (not disk that came with computer but full Tiger disk).
Thanks!

If the laptop boots from the ext, then that's all you have to do.

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