We have received few nRF52840 preview DK. And one among them has a white sticker label which says 2016.49 and all others have 2017.14.
Should we be using the ones with 2017.14 (assuming this to be latest)?
What is the version on the sticker? If all of them are version V0.9.0, then they should be 100% identical and only difference is when they are produced.
v0.9.0 is on 2016.49 v0.9.1 is on 2017.14
Both of them have PCA10056.
Ok, then there is a minor change in the BOM(bill of material). Probably just changed a manufacturer for one of the pin headers, or a button or some trivial component. The hardware files for the 0.9.0 is on this site, I guess the 0.9.1 will be added soon also. You can safely use all the boards you got, the nRF52840 chip is the same on all boards(packet variant QIAA and with build code AA0).