The DOOM Eternal Original Game Soundtrack composed by Mick Gordon is now available to download for Collector’s Edition owners. The OST will hit Spotify, iTunes & more in the coming weeks. Stay tuned!
I want to say it's one to one, but in all honesty I'm a bit fuzzy there. I can recommend JoyFreak's sister site AdminIntel - Admin & Webmaster Resource where there are lots for people of varying degrees of expertise with development, you likely can get a far more precise answer there!