Number of users in JIRA doesn't affect the number of users in Confluence. You can have different number of users in both by maintaining different groups.
Check out the online pricing for more details. https://confluence.atlassian.com/adminjiraserver071/installing-jira-applications-802592161.html
If it is Cloud, you just need to purchase it. Nothing to install.
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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