Butchers know little when it comes to animal husbandry. If you have one that does he is the exception, not the rule.
In the commercial pork world, no, very few animals are different from each other --and that's the point. I know many pig farmers, some near me, and each does things the way it works best for him. But huge commercial pig facilities are a different thing. In mass produced pork few animals move much at all --they are not frolicking about the farm-- as movement is restricted. The hybrid breeds used are standardized, feed is standardized, the facilities themselves are standardized --all to make production fast and 'efficient'. Commercial pork production here (I am not talking about Dave in Canada who can speak for himself and how he does it) is frightening; disgusting, actually, to me, which is why I shy from mass market pork.
The issue of 'natural' v. standard is one that concerns several issues, not the least of which is the use of feeds laced with sub-therapeutic doses of antibiotics as the standard. This has been going on for a long time and is one reason why some researchers think antibiotic-resistant bacteria have taken off. (If one looks at the rise in mas market pork production facilities in terms of date and location it is hard to miss the corollary of increased antibiotic-resistant bacteria, which are usually evidenced in these areas first, then spread. See this very recent op-ed on MRSA, from two days ago,
here.)
I too support local producers --but I ask about what they feed and how, and look at their facilities. I don't buy from those who raise their animals like industrial producers do --animals inside for their whole lives, little movement, etc. When on the road and not near a farmer I can buy directly from I'll buy natural over standard or, preferably, organic over anything else. The laws for organic production are stricter.
Though beef production is not fraught with the horrid conditions of industrial pork production, thankfully, I do the same when it comes to beef. Not interested in hormone- or antibiotic-laced feeds so I buy local from ranchers I know (or get to know) first, natural or organic if buying at the store.
I am not telling anyone else to buy. I do think people should look at and learn where their food comes from and how it is produced, then make decisions that best suit them. An image of pigs rolling in the grass, playing in the sun (pigs are very playful), the farmer doling out feed from his fields is erroneous, at the very least in terms of how the vast, vast majority of commercial pork in this country is produced. (Google industrial pork production and look for sites with videos, taken by hidden camera (the operations are very hush-hush), of the realities if pork production. In years past I had the rather unfortunate reality of having to visit several on a somewhat regular basis --and that's why I don't buy mass market pork.)