Anyone have information on the economy seat configurations?

I flew two legs in an A350-900 a few weeks ago. On the first leg (SYD-BKK) I was in the last row and the seat was squishy - both legroom and width. On the second leg from BKK to OSL I was in the middle of the front section and there was more legroom and the width-pitch was about 1cm greater (based on my 'cubit' - about the same as on the A380). I think the second flight was a 35D configuration - didn't catch the first one. In both cases I was in the window block of seats.

Is this difference a function of where I was sitting, or just different aircraft configurations?