Moving from one account to Family Sharing

Hello -

My family has historically used a single iTunes account for purchases, including iTunes purchases, including iTunes Match. We have moved music between our computers via this single account that was not purchased from iTunes, instead downloading it via iTunes Match.

If we switch to Family Sharing, will the "iTunes Match" songs (downloaded from familyaccount@email.com) be able to be used with iCloud Music Library on individual accounts (personal1@email.com and personal2@email.com)?

What is the best way for me to make this change? We don't all need 15,000 songs in our respective libraries, but I don't want to lose the non-iTunes-purchased music in the transition.

Thanks!