If we look at the batteries specs
***Late 2013-2014 - Battery Model #A1494***
Watt Hours - 98 Wh
Voltage - 11.26 V
Milliamp Hours - 8700 mAh
***Mid 2012-Early 2013 - Battery Model #A1417***
Watt Hours - 99 Wh
Voltage - 11.26 V
Milliamp Hours - 8800 mAh
They are clearly a bit different, they are also physically different. Why don’t you exchange the battery for the correct one. Give the iFixit Store a ping, I’m sure that can exchange it.