was wondering if the lower units off of these motors would interchange...my ten h.p. evinrude(103020-e06211) is kicking out of gear in forward..i have an old 9 and a half with a good lower unit(model#9r-695)(serial#j3091683) i was wondering if i could switch lower units ...if not could i switch gears?? please let me know..they appear to be the same length(on the outside) thanks (thay are both short shafts)