I'm trying to remember when I got my Barclays. I know there was a difference with mine also, I think they use a FICO score enhanced with their own. I'm going to move this over to CCs, they would probably know a little more.
The score Merrick offers is a bankcard enhanced one, I believe.
However, your score from MyFico should have matched Barclays since (based on what others have indicated) they pull TU98.
I'm really surprised with the differences.
My Walmart tu and myfico tu scores are over 100 points different so I can understand the shock of different scores