Installation Migration?

[Samuel V. Green III]

I'm doing a clean install of MacPorts on one of my macs with  OSX  
10.4.1.9.
Once my installation is satisfactory,  can I simply copy the "opt"  
directory to different
system with the same OS updated as well as a clean install of MacPorts?

I want to build a new server on my powerbook and move it to a  
PowerMac once
I have it set up.  Anyone tried this?

Thanks for anyhelp!

--Samuel