It's funny... I looked around the web for a few minutes and I found the same thing: The part numbers for the EBC Green pads are the same between the xD and the Vibe. However, every site that had other brands available for either car did not show those same ones for the other... so I wasn't able to cross check any other part numbers.
My guess would be the same as yours, Chels... that the front pads are the same between the xD and the Vibe. It could also be that they made a mistake with the Green pads. I mean, if the Red pads are the same, too... then why didn't any site I found list them for both cars?
2011 Subaru Outback 2.5i Premium
2009 Scion xD - SOLD
FOR SALE: xD cabin air filter, (3) xD oil filters, Assenmacher oil filter wrench for xD. (all filters are OEM)
FOR SALE: xD original shift boot for 5-speed. New condition.