One format of expressing this identify is X coY where X and Y are genders. Example: girl coboy.
A cogender person may want parts they don't have that are associated with their cogenders, but they don't need them. This doesn't mean they don't experience dysphoria, just that they are fine with the parts included in their gender identity. Example: an agender cogirl person assigned male at birth may feel dysphoria over their genitals (and the reactions thereof) and may want breasts but doesn't need breasts.
One type of cogender identity is cofluid, which is a genderfluid version of it. In a cofluid identity, one part of the cogender identity is static but the other part(s) change, possibly to match the first part. For example: a cofluidboy has a cogender identity that always includes male, but the other identities vary.