Can a beneficiary's race change in the MBSF: Base?

The Master Beneficiary Summary File: Base file (MBSF: Base), a research identifiable file offered by CMS, contains two annual race variables: the Beneficiary Race Code and the Research Triangle Institute (RTI) Race Code. There are studies that look at the accuracy of these race variables(1,2), but there is little information about whether the information changes within the data itself.