Carry on x Keep on: Qual a diferença

Teria diferença de uso ou alguma regra gramatical entre CARRY ON e KEEP ON no sentido de continuar? Nos exemplos a seguir ele são "interchangeable"?
- Sorry, I interrupted you. Please carry on.
- You’ll have an accident if you carry on driving like that.
- I want to carry on with my course.
- He stopped and looked back, then carried on down the stairs.
- You just have to keep on trying.
- If you’re good, they might keep you on after Christmas.
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