I have my own definition of this, which distinguishes it from both,
- Working hard means working from the thoughts of others or superiors. We just continue or in other words we apply that thought.
- smart work is, something that leads to work is from our own thinking, how we work becomes easier than others. we make work (of course that makes money) and we own that work our way.
I tend to disagree with this view. There is a saying circulating on the Internet which says that whatever you try to do has already been tried and it didn't work out (or something to that tune). And I think it can be rephrased as whatever worked out for others will likely work out for you too. So I don't consider it working hard if you follow someone's lead in working smart. Whether you actually succeed at reproducing the success of others by following their steps is a different question, though. But I see nothing wrong with that as long as you know and understand what you are doing.