Is this the conversion mule ear lock that you want to swap out?
http://pioneerarms.tripod.com/id3.html
Does it have this lock plate installed?
http://pioneerarms.tripod.com/id11.html
Does it have 1 or 2 lock bolts?
Whether the lock can be easily reinstalled depends on how much the stock was altered when the kit was first installed.
I don't know if this mule ear kit had any design changes over the years that they've been offered or not. Maybe you can ask the outfit that sells the lock for more details.
Do you know whether your rifle was originally a TC flinter or not?
Maybe it would be worth more money with the mule ear lock installed unless the barrel or lock is bad.
Why not just sell the gun and the stock and use the money towards buying what you really want. Folks may pay more for the mule ear lock, stock & barrel than you'll pay for the replacement.
One place to sell the barrel and/or stock separately is on eBay.
Or list it in the classified ads at the top our own BP forum page.
Can you show us a picture of your rifle?
Is there anything wrong with it?