Difference between the 2.5 gen and 2nd gen

I'm interested in the difference. Obviously there is a minor body difference but were there any changes inside? I'm buying used weather techs from a 2010 and want to put it in my 2015.

 

You're good! Do they have the little holes in them for your floor tabs? That will be the only problem you will encounter I think

 

As Josh828 said, the attachment posts have changed, but the floor layout is the same. You'll have to remove the tabs from the floor (don't know if you can do that easily), or modify the mats. Of course, then you'll have two extra holes in the mat, which kinda' defeats their purpose.
I recently traded my 2010 AC for a 2015 and kept the Weather Techs with the intent to use them in new AC. Bought Husky XACT fit mats when I discovered the WTs did not fit. Like the Huskys better.