I have my doubts...as far as I know there are only 2 generations of gu10 colour: the 1st generation is much longer and has 6.5w, but this 6.5w looks like the 2nd generation...I would have guessed that it was a printing error?!

The 6.5w (1st generation) is brighter than the 5.7w (2nd generation)...xD
The 6.5w is taller (longer) and less intense in green (more yellow).