Usually, when you present your work in a conference, it shows the work in progress, i.e., one part of the work that is preliminary & usually unpublished. If this is published as a part of conference proceedings, it is advisable to mention this while submitting to a journal. But, the research article submitted to the journal should have a much more exhaustive data and it is also better to change the title of the article.
If the paper is already published in the journal, you could contact the journal editor and ask the permission to re-use the figures/data. It is also a good idea to cite the published article in the conference presentation. You could contact the conference organizers in case your paper gets published and let them know of this. The Abstract that you send to the conference might or might not be published in the conference proceedings keeping in view the guidelines of the conference; it will be at the discretion of the organizers.
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