Should CFP topics stay the same?

I am starting to send out some CFPs for next year. I'm wondering if I should always apply with the same topic for different events, since there might be different people at each event, or if I should apply with different topics, since there might be the same people at the same type of event.

I am aware that each event is looking for different types of talks (light, full length, etc).

Thanks for your insights 🙃