What is the difference that you see?
It reminds me of a saint talking about love and forgiveness.. I wish I had the quote at hand but cannot find it.. so I will try to tell the sense of it imperfectly..
That if someone does you harm, destroys your house, slaps your cheek, does all sorts of evil.. and you simply do not pay him back evil for evil, if you simply do not mind at all.. this is still not perfect. This is still not enough for God.
What is perfect is to repay evil with good.. to give and love. To give your cloak to the man who has slapped your face, to help that person with love.
When I think of resignation I think of it as having an unwilling part that is going along anyway.. when I think of acceptance I think of embracing..
But this is putting distinctions on the two terms that often do not exist when people use them. It's just how I am thinking of them in contrast to each other now.
Normally I would not think of these terms that way.