If it does, buy a lottery ticket.

While the 20's and 16's of all grades were made on the same size frame, there were changes made throughout the years. Most notable is the inside radius where the top tang emerges from the frame.

Even if you found two that were made weeks apart, you'd be lucky to get a good match. Given the manufacturing techniques of the era, there was a fair amount of handwork even on the lowly SW.

Still.....people do win the lottery.