I'm not a goat person but I know a little about sheep & cattle feeds in my own area which may be useful.
Depending on your local supplier you may be able to get a dairy mix if you prefer a mix to nuts. I feed Hillie, my Jersey, a mixture of the local supplier's 'Parlour Mix' (18% or 20%, can't remember) and their normal store beef mix (16%.) Another local supplier also does a dairy mix, and one for store beef (16%.)
Around here, beef mixes will include copper, which is not present in sheep mixes as Texels can have a reaction to added copper.
The second supplier told me the only difference between their sheep mix and their beef store mix is the copper - which, if sheep mix is not safe for goats, may suggest that not all cattle feeds are okay for goats?
Feed suppliers must be able to supply a breakdown of their feeds as it is a requirement of Farm Assured and other certifications that the farmer can provide this. If the supplier suppliers Farm Assured farms, they must be assured themselves and be able to provide this info to their farmer customers. Normally the info is on the label on the bag or on the invoice, or both.
Hope that's of some help.