In a motion for modification of judgment, what is the difference between a motion to vacate or withdraw a plea?

Defendant frames one of the issues in his brief's headings as whether the trial court should have treated his motion for modification of judgment as a motion to vacate the judgment or withdraw the plea. However, defendant does not support this issue with any argument or citation to authority. (People v. Earp (1999) 20 Cal.4th 826, 884 [normally, an appellate court need not consider mere contentions of error unaccompanied by legal argument].) Rather, the sole issue argued in defendant's brief is that defendant's conviction should be reduced to misdemeanor possession or that the matter should be

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