LiveTiles has the ability to import/export tiles between tenants/site collections.
The Save Tile screen.
In order to access the export feature, you will need to go to the Save tile feature located on the context menu when clicking on a tile. Once you are at this screen, you can enter in the Tile name and the description as you would when saving the tile to your collection.
Once you are happy with the name and description, click on the export tile. This will download a .JSON file which contains the information of the tile. In addition, you may be prompted to bundle images with the tile. If the tile uses external images, you can check this to bundle these images to be imported along with the tile.
If you would like to import a tile, you will be able to do this from the manage tiles dialog found on the landing page. To upload a tile, all you need to do is click on the add icon, select the JSON file and upload it. This will upload the tile into your site collection, allowing you to use the tile in this LiveTiles instance.