Project manager vs People manager: two identical jobs?

Let’s say you’re a great project manager. Does that automatically mean you’ll be a good people manager? Or vice versa?

This question came to me following a conversation with a colleague. He did not understand why he would not make a good boss when he was so well liked in the context of all the projects he had led.

These are two different jobs, in my opinion. Being successful in one does not guarantee success in the other.

Naturally there is plenty of overlap between the two. Both roles coax a team into reaching a target based on a vision. Both require keeping a lid on costs, sticking to deadlines, managing people and knowing how to put ideas across.

The difference is seen in terms of timeframe.