Transferring skins over to another engine shouldn't prove to be an issue, models are usually universal.
Some work will have to be done though I extremely doubt they're going to do this as this could potentially kill off the playerbase that paid previously which would technically lose all their content for no real reason.
Just a small sidenote on this topic. Respawn is currently using unreal engine 4 (not 5) on the upcoming release of the Jedi Fallen order sequel. The first game was really good by the way.
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