Answer
Yes — use the Import and Export Page buttons at the bottom of the Lobby Overview screen. Exporting can be done in three formats: Full format (a completely self-contained page including all its elements and data sources), Folder tree (pages, data sources, and elements laid out in a tree structure, but referencing shared elements/data sources by ID rather than embedding them), or Zip archive (the same folder-tree structure, zipped up). Importing uses a file browser to select the exported file, and if a page with the same ID already exists in the target environment, you're prompted to either overwrite it or import it as a copy with a newly generated ID.