Models saved in KMZ/KML format can be imported and processed in some 3D modelling software and further exported and saved to other 3D formats, including Collada 3D digital assets (.dae). Blender is good choice for this, as it is available for free. However this conversion should be possible in several other programs.
Convert Compressed Keyhole Markup Language (Google Earth) data to Collada 3D digital asset exchange data.
We have found 3 software records in our database eligible for .kmz to .dae file format conversion.
Microsoft Windows software - convert kmz to dae on Windows
A CAD 3D geometry translation software
Convert from kmz file format
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned kmz to dae. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
A very popular free program used for work with 3D graphics
Apple macOS / Mac OS X software - convert kmz to dae on OS X
3D modeling application for Mac