12.0 is older and 15.0 is newer. Some new features are introduced in newer releases that are not in older releases. Most features in the older releases will be in the newer releases, though sometimes a feature will be dropped in newer releases because it is no longer useful.
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Cisco's main site has a IOS version feature comparison tool. If you have access to it, you could compare 12.0 vs. 15.0.
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