You can transfer existing PC (Steam or Epic) world saves from your existing Save Games folder to the Dedicated Server’s Save Games folder and play the game on the Dedicated Server.
Depending on the platform of your Regular Build, the Save Games folders are located either in C:\Users[UserName]\AppData\Local\Moria\Saved\SaveGamesEpic
or
C:\Users[UserName]\AppData\Local\Moria\Saved\SaveGamesSteam
Please note: World Saves are .sav files that start with MW_.