I'm planning to buy some "GUMMIERTES Hard Case" for my MacBook Pro 13" mid-2010 (non-Retna),but I'm not sure is it compatible with my MacBook...There is written that it is for - MacBook Pros from 2011 ,without Retina" ...It's ok because it is for non-Retina,but is there physical difference between 2010 (my version) and 2011 ?? They made a mistake - or not?? 