The two brands are the same. What's-his-name(sorry guy, drawing a blank) from FP-10 who posts about his product frequently has said that there was a way to tell the difference between the earlier formula and the new improved formula - not between SC and FP, but between the old and the new.
I think I'd better go find the info.
Okay. Here's the quote from 1911Forum by George/Mr. FP-10...
"In order to tell which one you have, just shake it up a bit and pour a bit out in a clear glass or vessal. If it is cloudy-amber, it's the older formula that did need shaking. If it is clear-amber with no cloudiness, then it is the new formula that does NOT need to be shaken at all."
Either way, it's all the same stuff, a CLP. My old Shooter's Choice FP-10 bottle says to use a good rust preventative after using, but that's only because they want to sell their rust preventative.
John