I don't think so but I'm not sure.I think you're talking about flattening agent that's used as you said to cut the gloss back-the more you use the more the gloss is lost.Usually this is in the mixing tint rack for single stage paint but bome basecoat formulas will use it.You can tell this stuff because it usally has a dry powder around the lid and wherever it drips and dries.If it isn't stirred for a few days it settles into a thick paste in the bottom of the can.
The milky clear looks very similar but doesn't settle and clump up like the flattening agent.Have the guy at the paint store look up a formula for a color.The milky clear will be the last ingredient added (or at least should be).Then get some of it and some of the 'clear' mixing clear and mix both together 1-1,then add the color and amount you want,then reduce the whole mix as you normally would.Usually the store only keeps the flattening agent in the smaller cans (quart here) and both clears are usually kept in the larger cans like gallons here.Let me know if we're getting this worked out.
Oh,I forgot,the mixing ratio I said before of mixing the toner and blending clear 1-1 was for blending out those hard to blend colors.If you want to make candy or pearl with it just add a little pearl or toner until you to get the effect you want.