EDIT: looks like i'm wrong about the 3.1 bulbs only having the 'richer colors'. both 3.0 and 3.1 have the richer colors.
Heads up, that these are 3rd (3.0) generation and not the 3rd (3.1) generation aka 4th generation. 3.1 is the 'richer' and newest set of bulbs.
https://www.reddit.com/r/Hue/wiki/hardware_specifications
White body with silver lettering. White contact (the bottom tip). Serial number on the back: 9290012575A (ends in A)
White with gold lettering. Black contact (the bottom tip). Serial number on the back: 9290012575 (doesn't end in A)
that being said, does anyone have any feedback on using these bulbs with 3.1 bulbs? I know they cross-play with no issues but I'm looking for feedback specifically on color differences they notice? i imagine have different bulbs in the same room might be obvious if you're going for the same color tone but in a different room, i imagine it won't be obvious to the naked eye?