Hi Manel,
A layer package (containing 2D layers and referenced datasets) can be shared with other users who work on ArcGIS Desktop.
Layer package—ArcGIS Pro | ArcGIS Desktop
A layer can be saved with its data as a layer package (.lpkx). A layer package includes both the layer properties and the dataset referenced by the layer. With a layer package, you can save and share everything about the layer—its symbology, labeling, field properties, and associated data.
On the other hand, a Scene Layer Package contains 3D Scene layers and its referenced datasets.
Scene layer package—ArcGIS Pro | ArcGIS Desktop
Scene layer packages (.slpk) contain a cache of a multipatch, point, or point cloud dataset. Scene layer packages can be published as web scene layers to ArcGIS Online and Portal for ArcGIS 10.3.1 or later with ArcGIS Data Store.
Think Location