Different planet usually means different atmosphere. Different atmosphere means different optics mumbo-jumbo (thoroughly explained across the internet, like here). Different optical properties usually lead to different sunset colours (and also there seems to be some sort of evidence that the atmosphere composition may be correlated to the ability to support life, but it’s mainly about sunset colours).
Obviously, NASA created a sunset simulator, because why not.
Of course, there are very good reasons for doing so. Here you can find the original post describing this result.
These simulations are part of a bigger project called PSG (Planetary Spectrum Generator), that focuses on synthesizing and retrieving planetary spectra (atmospheres and surfaces).