According to Dell's article, you won't be able to put DDR3 into DDR3L slot and get it to work because boards utilizing DDR3L expect your memory to work on 1.35V, compared to 1.5 v that DDR3 memory requires.
However, it would work the other way around: DDR3L is designed to support both 1.35V and 1.5V operating voltages. As a general advice, you should also look up your board's memory support list. Who knows what kind of voodoo magic manufacturer used on your board; you might even be able to get it to work :)
EDIT: In your case, that memory stick would work fine, because it is a DDR3L stick. The difference between DDR3 and DDR3L is only in operating voltage; DDR3 operates only at 1.5V, while DDR3L operates on both 1.5V and 1.35V, as stated above. Other than that, they are pretty much the same (at least from practical standpoint).
1Wikipedia says the major difference is that DDR3L is 1.35V, and the memory is stated to work at 1.35V, so I'd imagine so. – a CVn – 2014-09-06T08:27:20.473