Vegas Volt is more of a vibrant peach, in my opinion. I recommend putting on a lip moisturizer before hand if you have dry lips, it will last longer and look more even through out the day! Impassioned is a hot pink/fushia colour - extremely bold. I'd say that Vegas Volt is a more wearable daytime lipstick, it's still bright but just not as bold as Impassioned! I'm loving them both atm, although I do have to get more used to Impassioned!
Below are some swatches :)
Talk to you again soon!