RP environment migration

Hello,

We have a customer that is replacing an existing CX, which is a target for RP CRR, with a new VNX.  The current RP environment is large and it is replicating about 100TB of data.  We'd like to avoid replicating all that data over the WAN again.  Question I have is, can you migrate all the target luns to the new array (via MV or SANcopy) and re-establish the consistency groups?  Will it do a full sweep and figure out that the target luns are not brand new and only copy over changes?