MBZ W215 EIS SWAP

[dd1]

Hi, everyone, would like to swap a mbz eis w215 chassis, it has 2 MCUs, hc908 4j74y mask. in order to swap, do i need swap both eep or one only is enough? and do you guys suggest bdm or not? thank you in advance

[mercis]

one with immo,other km inside
clone with r270...