oh yes - the RAW image will look different after processing, mostly as you have a greater control over the image and so and tweak it so that it gets just how the image should look/you want it to look.
since I have been recently using RAW mode I don't tend to ever touch the jpegs versions, but they are usefull for scrolling though to pick out the keepers on the comptuer as they tend to load quicker - then I just note down the number and then open up the RAWs