These two are quite often used as synonyms, even I sometimes catch myself doing it. But there’s a fundamental difference.

Reading a time management book will not improve your productivity. Does this mean time management doesn’t work?

You want to leave work on time, but there you are, sitting at your desk instead of eating dinner with your family.

We all have limited amounts of time. Wouldn't it therefore make sense to make every hour count?

Have you ever noticed that a task you're trying to do fits pretty neatly into whatever time you have available?