Well, yes, they are different.
In terms of definitions, gender identity, I know individuals who probably define this better than I can. The definition that we have and we have been speaking to is that gender identity is each person's internal and individual experience with respect to gender. This is their sense of being a woman, a man, both, neither, or somewhere along the gender spectrum.
In terms of gender expression, this is the outward expression of how an individual publicly presents themselves, whether that be in terms of their hair, their body language, their voice, or their makeup.