The short answer is yes, for all practical purposes they're the same. All should work fine.
2 minor caveats:
Some very early (like ~9 years ago) WS2811 used half speed 400 kHz bit rate. Adafruit sold some long ago, so you'll usually see them mentioned in Adafruit's tutorials, even though they're pretty much ancient history now.
Most of this stuff comes from Chinese vendors who generally ship working stuff, but counterfeits and mislabeled substitutions are the norm rather than the exception. For example, LED strips I've bought all claiming to be WS2812B have obviously different chips inside when viewed under a microscope. Software compatibility isn't really an issue, but if you're building a big LED project, I highly recommend buying plenty of spare LEDs at the time of your initial order. If you try to buy replacement parts months or years later, you'll probably get something that works fine, but whether it is optically similar enough is an open question.