Jpg vs raw file size PSE9/Camera raw 6.3

It seems that there is quite a difference in jpg file sizes between converting jpg's Process multiple files (batch) or Save as (single photo).
I'm converting Sony A580 arw files that are about 16xxxxKB each, when doing batch processing file sizes for jpg are larger than raw about 19xxxKB (setting jpg max quality) but when saving same photos Save as setting max quality 12 file sizes are about 14xxxKB.
Has anyone noticed same behavior when using Camera raw 6.3 and PSE9  ?
Edit:
Ooops, I had Auto sharpen selected when I did batch processing.

None of this is unusual, and I wouldn't worry about it at all.
I would advise against saving quality 12, it gives you very large files but rarely if ever does it result in a noticeable quality improvement over level 9 or 10, which are smaller.
If you want to read more about this, here is an excellent article written about Lightroom, but the concepts are the same (PSE uses a 0 to 12 scale, while Lightroom uses a 0 to 100 scale, but other than that, everything is the same for PSE). http://regex.info/blog/lightroom-goodies/jpeg-quality

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