When it comes to dupes, I am pretty particular and I think something should only be deemed as a dupe if it is exactly the same in quality and character. That being said, I do not believe the Jazz and Sand Tropez are dupes. That would be kind of silly for the same company to have two identical polishes with two different names anyway, although I'm sure it's been done. I do think if you have one, you don't really need the other. But me being an Essie lover and on top of it a nude lover, I am happy I have both.
For the actually manicure with Jazz, I decided to "jazz it up" a little (go ahead and roll your eyes, I don't mind!) with Essie As Gold as it Gets.
Jazz is just a tad darker.
Do you need both based on this picture? Probably not!
This is just Jazz
Jazz with As Gold as it Gets layered.