Whats the difference between light bisque and light buff lancome effernice concealer?

The salesguy gave me light bisque and i asked for light buff. im going on a trip tomorrow and i was wondering if maybe i can get away with it. maybe i can add moisturizer to it. Light bisque looks a little yellow. any suggestions would be great. Thanks.|||Light Bisque has yellow tone and Light Buff has Pink tone in it.