in the same coin

cultural (Nordic) connection and few times test (https://thehorusheresy.com/choose-your-legion) directed me to Space Wolves

The Space Wolves Chapter of Space Marines is one of the most idiosyncratic and anti-authoritarian in the Imperium, in terms of both tactical organisation and overall philosophy. In both these areas their practices sometimes contradict traditional norms and Imperial decrees. The Chapter is also fiercely independent. The Space Wolves' peculiar qualities have created problems with Imperial authorities, who have sometimes interpreted Space Wolves' actions as non-cooperative, defiant, or even heretical.
After the Months of Shame, The Inquisition came to view the Space Wolves as heretical, and Grimnar as defying the Chapter's mandate and mission, thus putting him in clear opposition to the Imperial Throne
Space Wolves are loyal only to Allfather/the emperor and Primarch Leman Russ not to a superior imperial official.

The Iron Warriors to be sure are known for their disdain of Chaos, but they aren't a monoculture.
They don’t serve Chaos, it’s just another tool to be used.
generally are distrustful of the Chaos gods
Like the Iron Hands they used bionics often to replace mutated limbs, as they hated all forms of mutation.
They looked their Primarch Perturabo with hatred

The iron warriors actually had the largest percentage of loyalist marines of all the traitor legions
Iron warriors had the biggest numbers of loyalists of the whole heresy, the most famous being Dantioch.

very pragmatism and logic
Like many of the Traitor Legions of Chaos Space Marines, the Iron Warriors' current organisation in the 41st Millennium is completely non-standard. A grand company will often be divided into component warband detachments led by lesser Chaos Champions. There is a tendency to operate in multiples of three.

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