Merge Fortnite accounts?

I play on a Nintendo Switch Fortnite. I got a ps4 yesterday and of course I installed Fortnite. But I don't want to throw away my switch account ". Can I have the same account on the switch and on the ps4? If yes, how?

Yes you can log in with your Epic account, which you also have on the switch, right?

Maybe this will help you:

https://gegamenews.com/index.php/2018/09/27/anleitung-wie-verlinke-ich-mein-fortnite-epic-konto-auf-switch-und-ps4.html