Is There a Difference Between Gratitude and Greed?

I think greed often arises from a sense of not having enough, or when we compare ourselves to others and conclude that we don't have as much as everyone else has. Gratitude, on the other hand, assures us that what we have is enough. It seems that greed and gratitude cannot peacefully coexist. And i think if we experience a greater sense of of gratitude, we're less likely to take unskilful action that's fueled by greed.