They are both listed together on one MSDS sheet.
The haz chems are potasium chlorate <10% ,,the same stuff that fired corrosive primers makes steel rust I believe
and iron trichloride <5%
Might be a slight difference in the concentration in each product,,just a guess of course. But if it rusts the metal,,boiling will turn that brown rust to blue/black.
I use Laurel Mtn Rust Brown Soln for all my slow rust bluing..same result,, boil it and it turns blue/black.
I do use Mark Lee's Express Rust Blue soln as well.
Was a time when I used BirchWood Casey Muzzle Loader Quick Bbl Brown for Express Rust Bluing.
Same result with boiling,,turns it blueblack.
That worked good as it had mercury bi-choride in it. They took it off the market of course when the world went Green and just as well.
The newer stuff is Merc free, probably has like what Mark Lee's stuff has in it but I never tried it since using Lee's soln.
