I am not an expert on the said motors but I can offer these diagrams that may assist you. Off hand common parts I see that can transfer is the starter spring. I have listed the information from:
Johnson shared common parts manual
Parts manual for Johnson HA HS and HD
Parts manual for Johnson TD20
It might be easier to place a want to buy ad in the Webvertise section and get what you need. There are plenty TD parts motors you could get a intact starter setup for a very reasonable price from our members.
Good luck with your motor!
Cajuncook1
