I'm supposed to make npc bronze hoe. I've made a lucky bronze hoe, and she will not take it. Are they not the same item?

Lucky is a procced upgrade. If it gave you credit for making it, you can pick one up from the market to turn in if that would be easier.

Where do i buy a bronze one at?

Usually central market.

Once I get going the normal ones get sold and lucky goes in my bag. 

Might be people up and running already.

The tip i saw for this one was...

To use a lower grade worker to make the lucky hoe because he lacked the skill to make it lucky it turned out regular.

That's how i got past this one anyway.