The Czech Research and Development and Innovation Information System is a governmental Current Research Information System (CRIS) for the Czech Republic with a good coverage of research outputs produced by Czech universities, the Academy of Sciences and other institutions. While it has traditionally used a national administrative identifier for researchers, since 2018 it also allows institutions to report the ORCID iDs of the researchers that were affiliated with them. On the past two years’ worth of data from this CRIS we analyze the coverage the two identifier systems and their level of agreement. We observe a very good level of agreement, with less than 1% of ambiguous cases for which we give the most frequent reasons.