Would it, in theory, be possible to get a planet like Mars's inner core spinning by crashing another planet or moon into it?

I'm not sure if enough heat would be generated, but this might be a simplest way to get Mars' Magnetic field going, by crashing a large body into it (perhaps Ceres?) - and, I realize the entire idea is bonkers/crazy. I'm just curious if, theoretically, this might generate enough heat to get Mars 1) completely molten, and leave it with a solid Iron core with a liquid Iron core spinning around it - enough to create a protective magnetic field.

If Ceres is too small, maybe Callisto (the furthest out of Jupiter's large moons).

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Would it, in theory, be possible to get a planet like Mars's inner core spinning by crashing another planet or moon into it?

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