Not necessary. In general, IMT is the best tool to check the components comptability. Even if you just go to the downloads for AIUM, under "caution/must read" it answers your question.
ONTAP Version Support: Unified Manager 9.9 supports ONTAP versions 9.3 through 9.9 on all platforms (except ONTAP 9.4 that is in EOVS). ONTAP 9.2 and earlier releases are not supported.
You can upgrade Unified Manager 9.7 or 9.8 to 9.9.