You can add the contents of a project made with earlier version of Premiere Pro on either Mac OS or Windows. In addition, on Windows, you can import a project made with earlier versions of Premiere Pro. The imported project’s clips and sequences are added to the Project panel in a bin named after the imported project. The bin hierarchy of the imported project is maintained within its new bin. Discontinued transitions and effects are not maintained. Use caution when importing a project into another project with a different time base or audio sample rate, because these differences may affect edit positioning and audio quality.
Importing a project into another project is the only way to transfer its complete sequence and clip information.
Also, you can open projects made with Premiere Pro for Windows, including any contents that may have been imported from earlier versions, in Premiere Pro for Mac OS.