Moving from Epic to steam

So I started played PD2 some weeks ago on Epic, since I claimed it when they were giving it away from free some time ago.

Since the game is now on sale on Steam, I was thinking of buying it there. -What differences are between the EGS version and the Steam version of PD2? -Is it worth moving over? -And can I transfer my game progress from EGS to Steam? (By the last I mean only game progress, I don't mind achievements)

Help would be greatly appreciated, thanks!:)