A cloud-based service included in Microsoft 365, delivering scalable messaging and collaboration features with simplified management and automatic updates.
If you are asking about Exchange (Exchange Online) Distribution groups, the answer is no, you cannot change their membership type after creation. You can however "copy" their membership and use it as a basis for creating a new group, Get-DistributionGroupMember (and Get-DynamicDistributionGroupMember in the cloud) can help wtih that.