Yeah basically denatured is cheap shit with other things in it, water, methanol and other byproducts. Most of that stuff is bad to drink (and inhale) but so volatile it's gone rapidly for reference a 2" by 4" plastic container with a half centimeter of pure methanol completely evaporates in less than 24 hours at RT. That last ~5% is a bitch to get due to the chemistry behind distillation, partial pressures of other things like water. But 100% non-denatured should be pure leaving behind zero added flavor -would make for an interesting comparison
Edit: it shouldn't affect your extractions at all really, water is the only thing that could end up in product and its whatever. If there are sugars and/or salts in it that's a totally different story