The green and yellow chartreuse are he same liqueur but vary in alcohol intensity. The type of chartreuse liquor (color) you can find will vary by store. Green Chartreuse liquor is much stronger in flavor and has a higher alcohol content (around 110 proof). The green version is the original version of this liquor. Yellow Chartreuse liquor is more mellow and not as strong with a lower alcohol content (around 80 proof). This liquor is sometimes called yellow Chartreuse and was developed after the original green liquor.