I have a recipe for a fruit cake that uses 2lb of mixed fruit plus 11oz currants and 15oz raisins

In the UK, mixed dried fruit is usually a mixture of sultanas, raisins, currants, and chopped candied peel, with little variation. If it is the same in America then I don't understand the addition of more currants and raisins, which would work only to halve the proportion of candied peel and sultanas

Is mixed dried fruit composed differently in the US?