Hi there, Joe…
Maybe Seeedineers 
can Comment but it looks to me that the LIB gives it away, in that “NO”, this one isn’t as full feature as the Older one. IMO it was more precise too. It does more sleep stuff according to the data sheet and some more Keywords in Library.
You could always UART them together and get the best of both and perhaps the benefits of the C6 too. 
Let’s see if someone chimes in on it with this Bump. 
I also notice the PCB has more area for Radar signal.
HTH
GL 
PJ 