The funny thing about these lipsticks is that the color brightens up and intensifies slightly once it has settled on your lips for a while, and this is when I really see the difference between these two: they are both neutral shades, but Giny is warmer with peachy-brown tones, whereas Gilian is a bit lighter and cooler, with slightly more shimmer and pink tones.
In the end, I'm quite happy with them both because they are neutral shades that contain just the right amount of brightness to avoid giving a washed-out look and are an easy choice when you want to emphasize the eyes with dark and smokey or colorful looks. Although I really like the way some light nudes look on some people, they can be hard for me to pull off, so these are a nice alternative!
Below you can see just how similar they look:
Photo above taken outdoors in sunlight
Photo above taken in indoor lighting with flash