5th dnd – Eberron brand of manufacture of the dragon brand variant

I do not understand how to apply the Dragon Mark variant to a human being in Eberron, especially the manufacturing mark of Eberron's Wayfarer guide.

Do the characteristics of the dragon mark (p.101) completely replace the variant human set (ASI, Skill, Exploit) or only the increase in the human varying ability score (for example, you always get a exploit and skill)?