Azure endpoints - different deployments

Currently we run a UI web role and a web service web role(WCF REST) on Azure. Each role contains 2 instances (for load balancing and meeting the SLA reqs.) The UI Web role and web service web role are within the same subscription but in different deployments. We do not want to merge the code bases (maintainability etc etc). So the UI layer is on xyz.cloudapp.net and the Web Service layer is on