It looks like they are all the same part on your link to Euro Performance. Don't know why there's 3 of them but all have the same part number which correlates to what it should be.Are the green ones for road use then, is it blue and yellow that are for track use (warm not suitable fro cold) I do alot of short journey to work. Tbh I am actually having second thoughts now about DS2500s I have paid less for the discsnow and I really don't want to spend too much on discs and pads as I had to buy the calipers brand new but didn't want cheap crap either. Was always put of by EBC everyone saying they are dodgy for short journeys.
I am not bothered about whatever reg 90 is I have HIDs on my car which is technically wrong and who would check brake pads!
I've had DS2500 on my car for about 18 months now (15k to 20k miles). Still got plenty of material left and reckon they will last a good while longer. I can't comment on other pads as have only used DS2500. When cold they work very well but when they get up to temperature you can notice a big improvement. There is much more bite and feels like it's stopping quicker.
They are quite expensive but if you look how long they last then works out not very much spread over the life of the pads. Also they are recommended by so many people and have nothing but good praise so you know they work well and you will be happy with them.