KW-rscos

I currently pootle around in a 1.4 cvh mk5a escort with no power steering, I do however just happen to have a mk6 escort with the same engine but with power steering, unfortunately it has too much rust to make it road worthy so i was thinking, how difficult is it to swap the PAS from one to the other and would I have any issuse next year when I drop a zetec in the mk5a??
also what will i get for the mk6 in scrap?