Not quite. Fallout 3 was all Bethsoft, and Obsidian mostly did Vegas.
Fallout 3 has no big story twists, and clear good guys and bad guys. The main quest is entirely linear, with a large spectacle near the end, ending with a pathetic boss fight. Most everyone (except Dad and maybe 3 Dog) comes off as one dimensional with only one purpose in life. There are some cool side stories and places (a cave filled with orphans, and a mad scientist's escapist simulation), but I recall them being static for the most part.
New Vegas is complicated and more gray in comparison. Who's good or bad is murky. I don't recall any big story twists, but the characters had depth. Take for example, Caesar: I doubt Bethesda would have thought to give him a tumor. There's lots of powerful factions, which not only have stories, you significantly participate in them. The main story branches off into about 4 very different endings, something that Bethesda didn't do until F4.
Back in the day, I watched the Zero Punctuation review of New Vegas[0]. I remember literally everything he talks about! I drank out of that toilet!
Then again, there was a large gap between trying Fallout 3/NV and Fallout 4, so maybe my perception changed.