Diet Coke vs Coca-Cola Zero in Canada

I have two cans in front of me. A black one - Coke Zero. And a silver one - Coke Diete or Diet Coke in Canada. Both 355 ml. The silver one says sugar-free cola. The black one says, simply, Cola 0 Sucre or 0 Sugar Cola depending on which side of the can you are reading.
Listed Ingredients on each can in order of quantity:
(1) SILVER: carbonated water BLACK: carbonated water
(2) SILVER: caramel colour BLACK : caramel colour
(3)* SILVER: phosphoric and citric acid BLACK: phosphoric acid
(4) SILVER: aspartame BLACK: aspartame
(5)* SILVER: flavour BLACK: potassium benzoate
(6)* SILVER: sodium benzoate BLACK: natural flavour
(7)* SILVER: caffeine BLACK: potassium citrate
(8) SILVER: acesulfame-potassium BLACK: acesulfame-potassium
(9) BLACK: caffeine.

In conclusion, the Zero has no citric acid, has natural flavour, contains potassium in the form of both potassium benzoate and potassium citrate (well, okay, here is your citric acid after all), and has less caffeine. The cans say that the BLACK can has 40 mg sodium vs 50 mg for the SILVER but no potassium quantity is included in the Nutrition Facts part of the label. Taste test? I will get back to you.

Thank you for reading
Northstar