How are aortic stenosis and mitral regurgitation murmur different?

Aortic stenosis: Causes a high pitched systolic murmur radiating to neck. Mitral regurgitation is low pitched early diastolic murmur with possibility of slight systolic component.

Mitral regurgitation: Mr murmur is an early systolic, holosystolic, or also referred to as blowing systolic murmur best heard over the apex radiating to the left axilla. Aortic stenosis is an ejection systolic murmur best heard over the right upper stern all border, radiating to the neck, and there may be an ejection systolic click heard over same area and apex.