Range is not the same for all weapons, what makes you say that ? The effective (best) range of a weapon is determined by bullet spread and, to some extend, recoil.
The SMG has had the following changes: Damage reduced, Less recoil on the first shots of a burst (similar to AR behaviour). This extends it's range a lot. If you're good, you can burst-snipe across douze with it now. It also means, that you are being rewarded for first aiming, then shooting, even in close combat. Just spraying in the general direction once you spot an enemy will now have you at a disadvantage, since you waste those first accurate shots.
The SMG has had the following changes: Damage reduced, Less recoil on the first shots of a burst (similar to AR behaviour). This extends it's range a lot. If you're good, you can burst-snipe across douze with it now. It also means, that you are being rewarded for first aiming, then shooting, even in close combat. Just spraying in the general direction once you spot an enemy will now have you at a disadvantage, since you waste those first accurate shots.