The order of the main sections of free and maven jobs are like this:

free
1. Advanced Project Options
2. Source Code Management
3. Build Triggers
4. Build Environment
5. Build
6. Post-build Actions

mvn
1. Advanced Project Options
2. Source Code Management
3. Build Triggers
4a Pre Steps
4b Build
4c Post Steps
5. Build Settings
6. Build Environment
7. Post-build Actions

specially the 'Build Environment' seems to be placed at the wrong place for the mvn job - because it is the setup of the job it feels more right to have it at the start of the configuration (like in the free style job).

Why there is a 'Build Settings' section in the mvn job but not in the free style job, I don't know... e.g. it contains 'E-mail Notification' which is available in the 'Post-build Actions' of a freestyle job.