mitzvah - Poor man donating 999 vs rich man donating 1000?

I have the following dilemma with my father in law. I'm stating that assuming that both men have given their 10% if a rich man gives $1000 he makes a bigger mitzva than if a poor man gives $999. My take is that Judaism is about actions and general world improvement more than intentions. So that extra $1 makes another child eat then the rich man made the world better than the poor man even with the extra effort that he endured.

Is there any direct reference in texts about bigger mitzvot being accounted on results instead of intentions?

Do the texts specifically say what would be the bigger mitzva? To elaborate further, which action is better looked in the eyes of Hashem (Which action has the bigger reward)?