How is a motif different from a theme?

a motif is a recurring element in a story, but it is not necessarily the main message.
while the motif concerns the main message of a story, the theme is a reoccurring element.
motif and theme are two terms that have the same definition.
moral stories have motifs, while entertaining stories have themes.
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The accompanying normal probability plot was constructed from a sample of 30 readings on tension for mesh screens behind the surface of video display tubes used in computer monitors. does it appear plausible that the tension distribution is normal? the given probability is has a significant downward curve, so it is plausible that the tension distribution is normal. the given probability is has a significant downward curve, so it is not plausible that the tension distribution is normal. the given probability is quite linear, so it is plausible that the tension distribution is normal. the given probability is has a significant upward curve, so it is not plausible that the tension distribution is normal. the given probability is quite linear, so it is not plausible that the tension distribution is normal.