I just happened to notice this when I was listening to it again and the intro gave me the thought on Hyadain's cover way back when. Just listen to the first 15s and you'll notice that the strings in particular are THE EXACT SAME.

The only difference I've really found in regards to Soken's rendition of The Dreadful Fight was the use of the chorus as well as the various instruments to replicate portions of the theme. However, there's a segment in the music that's unique, and it comes after the second repeat. I'll leave a link to both the cover and the theme for Rubicante below so people can listen to the similarities and differences.

https://youtu.be/LWODmhPQze0 - XIV Theme

https://youtu.be/21RFBPoOTug - Hyadain's Cover