Without visualy seeing how the 3 core operates at present with the 2 gang dimmer , it is difficult to advise acurrately , but it is probabel that if as u state all u have is a three core , red , blue and yellow ( Earth sleeved green and yellow connected to earthing point of metal box if present ) , then possibly the red core , could be the feed in to both commons , and the blue and yellow could be two separate switch feeds giving two dimmer outputs to two separate lights . I would advise u get an electrcian in to verify this.
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