if ($keyversion = "version=16"){ 
    $keyversion = "version=12";
    print $keyversion;
    #will print "version=12" and that lets me know it will search for "version=12" and return the correct key/s
}

or 
if ($keyversion = "version=14"){
    $keyversion = "version=12";
    print $keyversion    #should print "version=12"