Chris, remember, King Richard is 75 years old now. While he will still sign anything put in font of him, his signature has changed a LOT over the past few years. So, don't compare a recent autograph to a more vintage version. While its close, there are natural differences in his signature now.
It doesn't matter that I have a TON of his autograph, whenever I see the King, I always get several more from him. He will always be a fan favorite. Hopefully, he will keep coming to each race for years to come.