Jesper_Ostman comments on (Almost) every moral theory can be represented by a utility function - Less Wrong
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Consequentialism (usually) has a slightly richer vocabulary than just "This is the right act": there's usually a notion of degree. That is, rather than having an ordinal ranking of actions, you get a cardinal ranking. So action A could be twice as good as action B. The translation you've proposed collapses this. I'm not sure how big a problem that is, though.
For some reason I've never understood consequentialist philosophers also often/usually collapse that cardinal ranking into the right (usualy one) action and all the other wrong actions, see this. Presumably they wouldn't worry too much about this problem.