I would never use different modules when upgrading a PC. This is not necessary, but can cause errors that only occur later. If you want to upgrade the Mini PC to 64 GB, I would therefore use 2 x 32 modules. According to the HP specifications, the HP_Pro_400_Mini_G9 requires DDR5-4800 MHz RAM. the module you requested is a DDR5-5600. according to Crucial (https://www.crucial.de/articles...), this should work:
DDR5 memory at 5200 MT/s can be downclocked if the system specification only supports DDR5 at 4800 MT/s. The same applies to DDR5 memory with 5600 MT/s if the system specification only supports DDR5 5200 or 4800 MT/s.

To find out, run the following command in RUN:
wmic MemoryChip get MemoryType, Capacity, Speed, Configuredclockspeed, DeviceLocator, FormFactor, Manufacturer, Serialnumber, Partnumber
What do you get?

Thanks for the answer in HP original are Samsung M425R4GA3BB0-CQKOL Digitec. offers the module without l at the end, the difference is according to Googel the organisatio 4gx 64 to ... does the internal organisation play a role for the MB? If so, I would of course choose the Digitec Samsung

According to: https://support.hp.com/si-en...
It is recommended you purchase DDR5-4800, maximum 64GB.

I hope this helps

wrong answer the new one has DD5 according to HP specs and I want to know if the crucal 32gb nonecc compatible are installed m425r4ga3bb0-cqkol