When 6 and 9 are found between two partners, the compatibility is usually very good. It is important that your respective negative traits aren't allow to grow and fester, creating an environment where you are more likely to clash. The give and take compromise is something you will need to do, in order to prevent unnecessary arguments from escalating, but because both of you are self-sacrificing, caring people, this is something that is not hard for either of you to do. Overall this is a highly compatible match.