Schwarzkopf Igora Royal Color Creme Tube 4-68 Medium Brown Chocolate Red by Schwarzkopf Professional

In a previous question someone asked what is the difference of 5-0 and 5-00 and someone answered that 5-00 is for gray. So is 5-00 better at coverage

Does this product has ppd or ptd?

does this line run a level darker? for example is the dark blonde more like light brown?

What is the difference between 5-0 and 5-00? They both are named "Light Brown."