Hi, I'm pig (83) and he is monkey (80). How comes that it results in 80% compatibility?

Jal, 80% compatibility is quite ideal. According to the signs, you should live a happy life together. But the only challenge is how to make the relationship keep refreshing, for both of you are the kind of person that doesn't like to live a similar life day by day. Maybe going out for romantic dates and excursions will help.