This is a Tiller shortcoming. There should be a way to consolidate - to have Tiller gracefully make Card 2 the same account as Card 1 and either hide (from everywhere*) or delete one of the two accounts.
I have a billizion accounts in my accounts tab because of this. And, yes, you can ‘hide’ them but it does not hide them from account drop downs in other tabs. But I’ve bitched about this before 
Clean Up on Aisle Accounts