Some of the cutscenes of the battlenet edition were different from the original DOS. I remember, in particular, the orc ending where they sack Lordaeron has particularly awful looking animations with the catapults, King Terenas and his guards (whose weapons are missing in that version), etc.

Or does this just purely use all of the Battle.net scenes?

Im not solved this. And I'm not going to do that. Yeah, i have only Bnet CD and too lazy for search-downloading original DOS each time i want play... but i recommend this for any other.

Also, i play original RoC campaigns in Reign of Chaos CD with only first two updates. And even TFT from CD version (1.07) without patches, cause in 1.10 and later video play in different way. Editing regedit and updating codec packs do not solve this for 100%. "Out of the box" v.1.07 (without amount of codec;s in Windows) play much better for me.

Hey, in what way are the cutscenes different in Warcraft 3 and TFT from 1.10 and later? How so?

They same, but work different - on same machine with same codecs installed (from indeo and microsoft only). Patched version requires reg.editing (do not changed too much for me) and codecs (at least C.C.C.P or even K-Lite codec pack - im not sure).

Video folder (mpq files) nver changed (i check in Total Commander) and played normally (without codecs) if you open MPQ file as media file in MPC-HC\VLC\etc. It look in 1.0.7 same as in media player. And worse after 1.10 update.

But i test it long ago. Probably even on Windows Vista (or on Win7). I didnt play Warcraft's on Win8 and do not have Win10.
Google says about cinematicoverrides string in registry. Im not sure what it is.