The God that spoke to the Pharaoh of Joseph was the same God Who spoke to the Pharaoh of Moses, who we meet in the Torah reading וארא Va’era (“I appeared,” Exodus 6:2–9:35). God does not change or grow, but He expects us to grow and change for the better. When we do, He is pleased. When we don’t, He is not pleased.
God showed great favor to the “Pharaoh who knew Joseph” because this Pharaoh accepted the warnings given to him by God and by Joseph. He and his people were blessed because of his humility and wisdom.
Similarly, the chief priests wouldn’t relent from their jealousy against Yeshua the Messiah (Jesus the Christ), yet Paul turned did turn away from his equally zealous persecution of believers.