If A boards are interchangeable across the whole CPS-1 catalog (up until SFII Championship Edition) narrowing your search to games that were released within a certain time frame means you'll miss many opportunities to get what you're looking for - by now there are probably more mix & matched boardsets on the market than factory paired boardsets!
How do you know that your boardset was a "matching" pair in the first place? If there are no serial numbers there's no way for you to tell?