There are two versions:
The override version will override the original science table. The original swatch will still be there, and my swatches will be added to the same catalogue item.
The standalone version is just my swatches, as a separate catalogue item.
You can have both in your game at the same time (no conflicts), but there's no reason to do so.
Note: I had a really hard time getting this item's swatches to cooperate in Sims 4 Studio. I tried my best, but there are duplicate swatches and one swatch doesn't match what is shown in game. If anyone knows how to fix this, please let me know.
I was really surprised this science table only comes in one color, so I added more colors to it.