On my HPUX 11.0 boxes I frequently install perl from '.depot' sources
received from either software.hp.com or from http://www.yqcomputer.com/
installed, I've tar'd the entire perl directory from the /opt/perl tree
and copied/un-tar'd it on other HPUX 11.0 boxes w/o and trouble.
I don't know about copying from 10.20 to 11i. Why not try it? I've still
got some 9.05 applications *** around that work on 11.0 that were
tar'd and copied from 9.05 to 10.20 to 11.0.