The thing you'd need to know, is that the EZ40 is sticky, like sugar syrup. Smokes a lot when heated, so good ventillation is essential for working with it (a fan blowing away from your work, and out a window is ideal.) You have to layer it on frequently while working. BUT, it leaves your solder seams shinier and brighter than I've ever seen with a zinc chloride flux.
Studio Pro's flux is more watery, so again, you'd need to just use more of it.
Giving yourself the chance to use a product, and figure it out is really key here!