No, the fundamental structure of a "type 2" add-on and a "Connect" add-on are totally different. You could share code in some parts, but they're packaged in totally different ways.
Start at https://developer.atlassian.com/index.html for both types and a general introduction to developing for Atlassian.
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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