Sure, Intune and CM are individual with each other and can also co-management with each other. You can set Intune for MDM (mobile phones & tablets) only and later connect it with an existing SCCM for Co-Management. You can also set CM only and later connect it with Intune for Co-Management.
Refer the following link to enable co-management for new internet-based devices.
Refer the following link to enable co-management for existing Configuration Manager clients.
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