What's the difference between a kneeling push up and a regular push up?

I understand the physical difference - one is on your knees and one is not. But what's the difference fitness wise?

I am doing this workout and it gives me daily exercises and some days it has me doing kneeling push ups and some days it has me doing standard push ups.

Do kneeling push ups target a muscle group differently than standard ones?
What's the difference between a kneeling push up and a regular push up?
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