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There is a contemptor dreadnought on GW shop site. (They are out.) But would that one be comoatebil with the forge world contemptor dreadnought arms?

No, the one on the GW has the arms and shoulders as one piece

Forgeworld arms don't include the shoulders, so you'd be missing shoulder pieces

Thank you.

Not directly compatible, but you should be able to saw off the weapons at the right point and then fix the FW weapons on instead.