Ja. Und das ist sogar beim Hersteller erstaunlicherweise dokumentiert. ;)

https://docs.microsoft.com/de-de/exchange/high-availability/disaster-recovery/recover-exchange-servers?view=exchserver-2016

If you do not have the installation media for the Cumulative Update (CU) version that was installed on the server to be recovered, you can recover a server using the latest available Cumulative Update. Only the last two CUs are available for download. For more information, see Updates for Exchange Server. Once the upgrade is successful, AdminDisplayVersion in EMS or msExchVersion attribute on recovered server will show old build number and this is a cosmetic in nature. We can either run setup /m:upgrade /IAcceptEchangeServerLicenseTerms or wait for next Cumulative Update release and perform the upgrade which will correct this.

Ok war mal wieder "wer lesen kann ist im Vorteil"!!!

Ich danke deshalb doppelt für die Antwort!!