Can you track 1080p and apply to 4k?

We did some temp work at 1080p and now the client wants us to take our work to final. We would like to use the HD mocha project and apply it to new 4k plates to save us some time. Is it possible to scale up the project or project data?

Yes, this should happen automatically. Just relink the HD footage with the 4K footage and the data should scale accordingly.