SVGZ is a compressed version of SVG graphics and should be supported in any of the decent vector graphics editor like Adobe Illustrator or similar. EMZ format however, is typically used for bitmap graphics so svgz to emz conversion is basically a vector to bitmap conversion. This is of course doable, but any vector data will be lost.
Convert Compressed SVG (Scalable Vector Graphics) to Microsoft Windows compressed enhanced metafile.
We found 3 software records in the database related to .svgz to .emz file format conversion.
Microsoft Windows software - convert svgz to emz on Windows
A powerful vector graphics editor from Adobe
Convert from svgz 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 svgz to emz. 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 professional photo editor and manager for Windows
Apple macOS / Mac OS X software - convert svgz to emz on OS X
Mac version of Adobe's vector graphics editor