Jpeg file size 6D vs 60D

Hi all,
Being a bit newer at all this I'm sure there is something I don't know that I don't know  which would answer this:
Been taking some identical test shots on my new 6D and my old 60D to compare.  Jpeg only for now, same "quality" setting.    I noticed that the file sizes of the pictures on the 60D were larger than the 6D's.  I would have thought that with a larger sensor and roughly 2mp more the 6D's would have been the larger, or at least the same.  Some of the 60d's were almost 3-4 mb larger.  
Lenses if it matters:  6D 24-105L kit, 60D EFS 15-85 IS.   ISO was the same in some, apetures pretty close in most.
What am I missing? 

Thanks for the response.
Good point on the noise reduction, I'll check those settings to see if they are on the same setting.
I tried to frame the shots exactly the same, using only the center AF point focused on the same point for both.   Got them pretty close.
I came across a 6D review that had a table showing the raw file sizes for various cameras at various ISO's, and it showed the 60d and 6d pretty similar (still not understanding why given larger sensor and 2 more mpixel) .  The 60D's got larger at the higher ISO.  I am guessing increased noise may be the reason?

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