Facilities for RFG and ULSD can be the same, however they do not have to be the same. EPA may issue a new number if the facility definition changes. Entities should still contact EPA to update their registrations, even if you plan to use the same facility and facility definition that was used for RFG.
Question and Answer was originally posted at Questions and Answers on the Clean Diesel Fuel Rules (PDF)(135 pp, 888 K, EPA420-B-06-010, July 2006, About PDF)