Can I migrate from data from my mac mini with differant

Yes you can migrate from an earlier macOS. However it is best to migrate from your old Mac's Time Machine backup instead of over Ethernet or Wi-Fi. A direct Ethernet connection is slow and Wi-Fi almost always fails complete the migration.

see > https://support.apple.com/en-us/HT204350

Yes you may. Migration Assistant is designed tp accommodate people such as you. No problem.