Depending on the version of Music maker you are using:
Importing Music Maker Jam (MMMJAM) project files in to Music Maker is not possible for versions later than, IIRC, Music Maker 2015, the Soundpools used were automatically downloaded on import.
MMMJAM projects are no longer compatible with the later versions of Music Maker.
Transferring the Soundpools may be possible providing both MMMJAM and Music Maker are using the same email address for download of the soundpools and activation respectively.
You would need to locate where the Soundpools are stored in MMMJAM and copy the entire folders to C:\Users\Public\Public Documents\Magix\Common\Soundpools folder