Pics of both bottles
DXS 1.1 (INOCOM) including reg (100% empty) = 1171 grams
Evil bottle 0.7 (Luxfer) including CP reg (3000psi filled) = 1172 grams
The evil bottle normally comes new with a PMI pure energy reg (195 grams), and are heavier than the CP regs(131 grams).
For information, so you know what a empty Evil bottle with a PMI reg weighs, i took some figures off a chart off PBNation.
Evil bottle (Luxfer Carbon Fiber 45/4500) + PMI pure energy reg , Empty = 1015 grams.
A filled bottle will be heavier due to compressed air.
Difference in length is very minor. Butted both bottles up against a wall, marking out very carefully, there is only 12mm difference.
I see the length of a bottle/setup to be more important than the weight. The weight between different manufacturers is very minimal, figures are probably around 20-30 grams difference. I doubt you will notice it when playing.
Hope this helps.