The SDS should include all SAFETY relevant information/ingredients for whatever jurisdiction. If the local area doesn't really care if it's hexane or pentane from a safety perspective, they'll likely just be lumped together behind a generic name/cas number.
It's absolutely not a BOM to reproduce a product.
Hopefully if you sum enough of those SDS across different jurisdictions, the actual list of ingredients will come out. Though I guess it isn't that simple.
I'd say a BOM is more like the list of ingredients (or inventory) of what's in a product.
Depending on what the product is, this may still be a long way from the full "recipe" (or method) to recreate the product.