Naphtha is a generic term, kinda like hydrocarbon, but naphtha means that the boiling point range falls with that of gasoline.
Coleman fuel is paraffinic and falls in the mid-range of naphtha. It's very low octane paraffin. That's why it burns cleanly without any black soot.
There are many naphthas.. straight run, hydrocracked, coker, cat, aromatic, steam cracked, and other special blends (like VM&P, varnish makers and painters). If you're selling a gasoline additive, and you want a solvent to disolve it, or to make your expensive additive fill a bigger bottle, you'd use a naphtha. Which one depends on what you're trying to dissolve.
The thing to remember, is that the naphtha is not the active ingredient...or if it is, you've been ripped off.