This conversion looks like re-saving of two MindManager mindmaps (.mmp, .mmap), each probably saved in different version of the program. This is most likely possible, but you usually can only convert older format to newer one and not the other way.
Convert MindManager map file to MindManager Mind Map file.
We found 2 software records in the database related to .mmp to .mmap file format conversion.
Microsoft Windows software - convert mmp to mmap on Windows
A brainstorm mapping software
Convert from mmp 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 mmp to mmap. 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.
Apple macOS / Mac OS X software - convert mmp to mmap on OS X
A brainstorm mapping software.