Projects created using the latest version of Adobe After Effects and saved as Adobe Premiere Pro projects can be opened by the latest version of Adobe Premiere Pro.
When you export an After Effects project as an Adobe Premiere Pro project, Adobe Premiere Pro uses the settings from the first composition in the After Effects project for all subsequent sequences. Keyframes, effects, and other properties are converted in the same way as when you paste an After Effects layer into an Adobe Premiere Pro sequence. (See Importing from After Effects and Adobe Premiere Pro.)
You can also import Adobe Premiere Pro projects and sequences into After Effects, copy and paste between After Effects and Premiere Pro, and use Dynamic Link to exchange data between After Effects and Premiere Pro.