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Karol wrote:
if someone deployed a csm army, and on then informed me that he is rolling 1ksons powers, I would be mildly confused.

Well, yes, those are different armies which (mainly) don't share units and where the models being used don't match the datasheet.

We're talking about different subfactions for the same army, where the basic datasheet is the same and the models are the same, but the subfaction / paint scheme gives different bonuses. It's a completely different situation.

That is a fair point for the OP though - 1KSons, Death Guard, and (soon) World Eaters are their own things and not core CSM. You can use CSM models as 1KSons if you want and if your opponent's happy with it, but that does cross the line into proxying IMO.