I don't have the pebbled grey, but I did. I would not say there is a huge difference, but there is a difference. It is lighter than the grey quartz and the grey quartz has a touch of lavender that the pebbled grey doesn't have. Also, the pebbled grey came in the regular size Phoebe and the grey quartz came in the small.
Basically, yes. That is not to say that it isn't a pretty color, it is...I just tend to prefer darker greys.Did you get rid of it because you didn't like the color?