Vikings Storm is a "Total Convert" mod. The map will no longer be Calradia, but England. As for the characters, cities, cultures, factions etc ... They will become those of the series "Vikings" and "The Last Kingdoms", as well as a bit of historical elements to fill the gaps.
If you want to play the Vikings Storm mod with the music from the series, you can download it here (they are in the latest version). This music may not be suitable for youtube videos or twitch lives.