Both the PKA and PKT file types originate from Packet Tracker so if any program is capable of PKA to PKT it would be this piece of software. Other than that, no other software is known to us that could convert PKA to PKT.
Convert Packet Tracer practice activity file to Packet Tracer network simulation file.
We found one software available in the database for this conversion.
Microsoft Windows software - convert pka to pkt on Windows
An interactive teaching and learning tool
Convert from pka file format
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.