I looked at the toribash colors.txt and there the exact same colors by the looks of it. Are they different in anyway?

Supernova is much brighter/lighter.

Vampire is like a blood red, while supernova is brighter

They are almost exactly the same, buy vampire, it's cheaper.

Not in colors.txt there are now some extra fields. I can't tell you exactly what they are, but one of them seems to be 'light emit', which will make the joint brighter. There is also the possibility for a negative value, as Void does not react to light in the same way as Demon, despite them being only 3/255ths away from each other.

27k + 32.4k + 4.4k = 63.8k

6k + 3k + 1k = 10k

-Prices in order of items
-Compare colors

Ingame nova stands out while vamp is dull

if you dont have a great graphics card there is absolutely no difference
(powerPC ftl)