size of JPG after processing

so if the RAW file is 25mb and I process that and save it as a 25mb JPG file, the JPG will be the same quality as the RAW file or at least as good as the JPG can be?

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http://500px.com/baneling
Canon T3i
Canon EF-S 18-55mm f/3.5-5.6 IS
Canon EF-S 55-250mm f/4-5.6 IS