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Just as the title says:
Is it possible for a supplement like the Clan Raukaan (who are an Iron hands clan) To ally with the 'vanilla' codex Iron hands or one of their succesor chapters?

I'd love to have some brazen claws backing up my Raukaans. One reason is that I want a captain with the Primarchs wrath.
the codex says you can bring chapters that has the same Chapter tactics (like Ultramarines and Novamarines for example), but I can't find anywhere were it talks about bringing them as an ally.

Only if they use different Chapter Tactics.
I have the codex, but not the Supliment. Does Clan Raukaan use Iron Hands Chapter Tactics?

Yeah, they do. That's too bad. Would have liked to not have to remember two different chapter tactics.

It seems that if you ran the Iron Hand forces as a Forgeworld Siege assault list it'd work around the same chapter tactic ruling? Siege assault counts as space marines with the exception that it can ally with space marines as battle brothers. Would that exception allow allying with similar chapter tactics?

Is that using Forgeworlds updated rules for that list?

http://www.forgeworld.co.uk/Downloads/Product/PDF/S/Siege_Assault_Van.pdf