Is it possible to invoke/execute Test Complete test cases from Command prompt?

Here's how to run TestComplete from the command line

https://support.smartbear.com/testcomplete/docs/working-with/automating/command-line-and-exit-codes/command-line.html

An alternative is to use TestExecute to run your test

https://support.smartbear.com/testexecute/docs/index.html

Getting a different version to run will probably be a matter of running the command line prompts from inside each version's directory.