Paul covers the nitty-gritty details about how the bruise to the serpents head unfolds as was determined in Ge:3:15.

That means the rest of the book, all of the OT and the 4 Gospels and Revelation are supportive of the prophecy and fulfillment of the bruise to the heel of Eve's seed.

They are two different things that have validity and neither is to be worshiped as that is a requirement only after the two bruises are fully manifested into reality.