Thanks for your question.
I believe that if you have obtained a ESOL certificate for Entry 1 (speaking and listening) from Cambridge ESOL and attend Cambridge ESOL for the Course then you will not need to complete another course to apply for naturalisation.
Check with your college that they are an "accredited college" for ESOL purposes, that the course you completed included the Citizenship Materials derived from the document "Citizenship Materials for ESOL learners" (ISBN 1-84478-5424) and ask them to confirm you have made relevant progress. They may confirm that your certificate is in fact confirmation of relevant progress.
From the sounds of it you should be fine, but do complete the above checks specifically with your college. I also attach a link to the ESOL page for the UKBA stating their requirements:-
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