Questions about Cross Progression

Hey all,

I've been playing DBD on Epic for around 2-3 years and want to make the move over onto Steam,

How easy is it to sync it all over?

Will I keep all my prestige's/levels on all survivors and killers?

Will I lose all DLC that I have purchased on the Epic Games store? As I don't want to lose any killers as I play quite a few DLC ones

Will I keep all cosmetics that I have paid for?

Many Thanks!