Very similar recipes. If you made American biscuits in the UK they would probably be called scones. But scones in America are sweeter than biscuits and sometimes have dried fruit or seeds inside or sugar on top, or extra flavors. American biscuits aren't sweet and they come in two flavors: buttermilk or butter. Sometimes people bake cheese into biscuits but that is mostly a thing at weird restaurants. Also scones are mostly eaten with tea or coffee, and biscuits are more likely to be eaten with savory things like sausage and gravy, or at a meal in place of dinner rolls. Though a biscuit with butter and a little jam is also great with tea.
I don't think UK distinguishes, but I've also never seen savoury or unsweetened scones. There isn't heaps of sugar but they've always had some sugar so guess it's closer to US scones.