Here's a key difference, though: speaking to Gamespot, Bethesda's Pete Hines said existing mods won't appear on Creation Club as paid products, and the existing mod environment will continue alongside as a distinct entity.
Hence Creation Club, announced for PC, PS4 and Xbox One during Bethesda's E3 2017 presser and immediately summed up as another crack at the whole paid mods scheme that went down like a lead balloon back in 2015.
But DLC is another, and that's one that makes money directly for the original publisher. Mods are a great way of extending a game's life cycle and generating further sales, and that's probably at least partially why Bethesda has made great strides bringing Skyrim and Fallout 4 mods to PS4 and Xbox One. Skyrim and to a lesser degree Fallout 4 seem to be eternal, and Bethesda would quite like to keep generating money from them while it pootles about making everything except The Elder Scrolls 6.
Bethesda's Creation Club is a Skyrim and Fallout 4 DLC pipeline offering paid work to amateur creators, not a paid mod scheme.