I don't know if this is helpful, but I do this sometimes to compare colors. Both of these were taken in natural light...
Here I have Instant Gold on my bottom lip and Garden on the top. I definitely like Instant Gold better because it's warmer and more neutral looking, where I find Garden sometimes is too pale and washes me out:
Here I have Love Nectar on my bottom lip and Flowerosophy on top. I think they are pretty similar, though Flowerosophy is just a touch more pink than Love Nectar. I like Love Nectar more because I think it has a much nicer irridescence:
I'm not really sure which of the four I'd say I like the best, but probably Love Nectar. I tend to wear it more, at least, because it adds some subtle shimmer to my lips and works well with a lot of the eye looks I wear.