Er, your question says you are using JIRA 7.1 and you want to upgrade it to 7.1. There's no changes between those two versions.
However, you can find lists of changes for all versions under https://confluence.atlassian.com/jiracore/jira-core-release-notes-781386726.html
I have multiple projects that use variations of the same base workflow. The variations depend on the requirements of the project or issue type. The variations mostly come in the form of new statuses ...
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