Hello !!

It's been a few days searching the web for stock and forend wood. Not lucky up to now.
I have a question regarding the stock size. Will a stock from a 12ga 1 size frame fit my trojan 16ga receiver?
Supposing the ideal situation, if I find an original stock from a 16ga will it fit right away or need some fitting(even minimal)?
Wish you the best
Piro