I contacted our local service people and it sounds to me as though the
"new" motors are the same,but the gear on the shaft will be different.
When I stripped the old one, the gear is just a push or shrink fit on
the shaft so changing it will be no problem.
Tony

Steve wrote:

I just found the spare motor part number listed in the Raymarine Autopilot
Customer Support page Q&A, keywords 'cruising spares' . Resulted with this
number N012 4000WD Motor Assembly..

(the link to this info is far too long to repost here but I will try anyway)

http://raymarine.custhelp.com/cgi-bi...YWdlPTE*&p_li=

Good luck

Steve
s/v Good Intentions