I have Ambient and Flattery from the Lightful Colour Collection as well as Mega and Lil' Sizzler from C-Shock. They are extremely similar with only slight to minor differences. To me, Mega and Lil' Sizzler are "creamier" while Ambient and Flattery are frosty, but not obnoxiously frosty that looks as if your lips were dipped in white glitter. It's hard to explain -- you really should just compare in person, if you can. I love all four of them and on my lips they all look different to their "counterparts."
My lips are not super pigmented and pretty much every colour I have ever used shows up on me (a blessing and a curse) -- and I, myself, am not a big lipstick fan and I find lipglasses/lustreglasses a bit too sticky and tacky for my tastes (though I own a few of each), so lipgelees are perfect for me.
Honestly, if you have Ambient and Flattery or Mega and Lil' Sizzler you truly don't need their "comparisons" but it truly depends on the pigmentation of your lips and the amount of colour desired, to be completely honest.