yes
animagic, RL makes it easier, in Unreal Marketplace i'll have to do it all
If you create clothing, hair or accessories in a 3rd party tool like Blender, then you can sell the content anywhere you wish. However, if you bring that content into Character Creator and save it in CC or iClone formats then it can only be sold in the Reallusion Stores. In addition you are not permitted to sell any content that has been exported from either Character Creator or iClone in any 3rd party stores.