There are many more differences between Miss Emily and Calixta. To begin with, the differences would include their personalities (Miss Emily is very reclusive, resistant to change, etc.) and Calixta is more personable, friendly, and approachable. Also, Calixta is married and has a child. Miss Emily is not. The list could go on as there are many more obvious differences.
Similarities between the two might include their selfishness (Calixta in having her affair and having no apparent remorse for it and Miss Emily for also being unapologetic for her attitude, etc.) and their strong natures.