First of all I want to confirm that what is the project tracker and dropdown lists mentioned in the original post refer to?
If you want to migrate the list from one site collection to another site collection, you can follow below steps.
1.List settings -> Save list as a template. If you want to include list contents, then click on “Include Content”.
2.Site settings -> Click List templates under Web Designer Galleries -> Download the saved list template and upload it into other site collection List templates gallery.
3.In the another site collection, Site contents -> New App -> Classic experience -> Choose the saved list template.
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