Are you sure that you are saving the jpegs to the same colour bit-depth in both applications?
You might also find that Photoshop is designed to be used in a print environment. This being the case, ICC profiling (technology that defines how to store information on the colour curve, and how it performs on various press footprints in relation to how it looks on a calibrated screen) data is inserted by default for you. You have the option to turn it off. Also, jpg compression levels such as "0-9" are relative to the software being used, and are not based on a definitive scale. I do what Paul does and use the "Save for Web" option - it works a treat and is easy to use to gauge the tricky size/quality ratio.
Cheers
Chris
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