What do you plan to do with the gun? The 1100s are 2-3/4" or 3", whereas the 11-87 is 2-3/4" and 3". The SuperMag will also shoot 3-1/2" fodder. The 1100 and 11-87 are 99+% the same gun, only difference is the gas parts on the barrel and 11-87 has a wider extractor.
What could have happened... did.
I do not trust Remington's dating service accuracy. If they were Match.com, you could end up with Nancy Pelosi.