Excellence means to perform a task in the best way possible, while perfection is the high standard, we tend to hold ourselves to, which can sometimes be disappointing or unrealistic. However, excellence is the best way to bridge the gap between the two. Excellence can even come close to perfection, but it might not be exactly perfect.
Also, the definition of what perfect looks like is different to many people. Excellence is more attainable, and it is always worth it to try. Perfection, on the other hand, is far more complicated. Perfection might look something like the figure skaters who compete in the winter Olympics.
Excellence may also be an attempt to be better than you usually are, and it can inspire you to go further into achievement every time you try. Most people think that perfection is an unachievable dream. However, it might not be impossible if you work hard enough.