AFAIK, there are several "grass fed organic butter" makers. I think that you're right about oil content. You can contact the packager and see what they say.
Yea i noticed tge costco kirkland grassfed from new zealand maintained its stiffness more than the irish kerri gold which was a little softer but not completely mush like lhe landolakes/hotel/store brands of regular butter
Are you sure they just don't have different butterfat percentage?
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