In Europe, they stop selling the 25 series up to the 5025. They fill the 35 to 45HP market with the F series (15 series in the US) instead and sell the 5025 and 6225, with 50 and 60HP respectively. We used to have a 3125, 3725 and 4225 available but I suppose it wasn't selling that good.
This makes it like:
05 Series: 1905 and 2505 Models with 19 and 25HP
00 Series: 2500 with 25 HP. They had to discontinue the 2900 and 3100, 29 and 31HP with turbo, because of the new emissions requirements in Europe. It'll pretty much work like in the US. Under 25 hp, no need for DPF or DOC. The 3100 was a great seller because in Europe, we tend to prefer smaller and more compact tractors with higher HP, instead of bigger tractors. It also had bigger tires and a wider stance.
F Series (15 series in the US): F36, F42 and F46 with 35, 40 and 45 HP respectively.
25 Series: 5025 and 6225 with 50 and 60 HP respectively.
K Series (45 Series in the US): K78 with 75HP.