Yes, 7mm vs. 4mm is what the size difference is, thanks! So this is basically the same chip. Not sure why this batch was so much cheaper than the other board but I'm not complaining. Yes, I've already programmed several of them, I bought 20, and I'm used to having to check the pinout for the FTDI and flip it around for different boards.
I don't need the extra precision of the 20MHz Xtal but it's not so bulky as to be an issue so no worries. I use these inside wooden bases for edge lit acrylic signs so the timing isn't critical to drive 8 or 11 WS2812B's.
Thanks everyone for the info!