How much of an overlap is there between milk, cheese, and beef? They're all coming from cows, but are they being calculated separately here? There are also gelatin and leather and other non-food products that come from cows. If there is a way to reduce that methane output, then it would be a lot more reasonable and it seems possible since it's impacted greatly by diet.
Dairy cows and beef cows are different breeds. There’s hardly any overlap worth mentioning. For the purposes of these kinds of reports, they might as well be different species.