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Tale of Two Wastelands is neat. Inserts the entire F3 into FNV's engine.
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They do. Every Bethesda game since Morrowind uses the same engine, on through to Fallout 76.
But New Vegas and Fallout 3 use the same ASSETS; all the character models and weapon models and stuff are the same. This makes it easy to rebuild Fallout 3 in New Vegas (which is what they had to do, re-place every part of the world and every character, item, etc. by hand and then reinstate all the quests manually to recreate the Capital Wasteland as a separate locale).
IIRC one of the biggest scripting issues they ran into was just getting the opening sequence and starting quest to work.