Patavium…as I mentioned, Mary was ‘full of grace’ or ‘favored’ because out of all the women in Israel, God could have chosen, He picked Mary to fulfill Isaiah’s prophecy & bring our Lord miraculously into the world, proving that it wasn’t a normal human birth, but a Divine one!
However, Stephen was ‘full of grace,’ because the Holy Spirit gave him the power to ‘perform great wonders & signs to the people,’ & wisdom to some of the men who challenged him (Acts 6:8-15).
How they are the same, is that this ‘grace’ (‘charis’) was a ‘free gift’ given to them by God. How they are different, is the ‘form’ that God graced them. God graced Mary who gave birth to our Savior, while God graced Stephen by giving him power & wisdom. How they are also the same is that they were both sinners, which ended with their deaths, & when they were both glorified in Heaven.