1:1 NAT for a Data Center Move

[agall1]

Im moving my data center and cant get a L2 connection so the plan is use 1:1 NAT at one end so I don't have to readdress everything.  Installed pfSense at the new location and got 1:1 NAT working with multiple vlan's.  Now there is a request to have the new location connect back to the old.  Remember both site LAN's are the same subnet.  Im thinking the only way to do the reverse is to use another pfsense with 1:1 NAT at the original site and do some DNS trickery at each location.

Anyone try this?  Thoughts?  Maybe its time I just readdress everything

Thanks