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Without intervention from the chaos gods I think a primarch would be a more powerful daemon prince than a normal DP. I am not sure where but I have read that CSM can survive much more chaos power than normal humans. Their strengthened bodies mean they can take a lot more mutation before they loose their mind and become a tentacled mess. From this I could guess that a Primarch could withstand much more chaos power. Primarch are also near to the power of a human DP anyway and we know that the gifts they recieve improve on this so I would say a Primarch DP would be much more powerful.

This is assuming they both have recevied equall gifts.

If not the normal DP would require so much more chaotic energy to be a match for a primarch that its unlikely it would survive it. Another point is that very few individuals had recieved as many improvements as a primarch. The Primarch killed millions for the chaos gods very few people could match that so wouldn't be so popular with the gods.