Upgrading my wireless card in the M18xR2 Alienware lap top

Replacing my killer wireless n1103 card for the Intel 7260.HWMG.R Wireless AC Card which has two connection tabs for two antennae wires the Alienware has three wires used for the killer wireless

will the dual band work using the newer card connecting only the two wires and will these cards work in the Alienware lap top OS windows 10 pro

Thanks

Michael