LT-verisons.jsx

var master = app.project.item(1),  // master comp has to be the top comp in the project bin
    template = app.project.item(2);  // and the comp you're looking to make different versions of should be right below it

// the only layers expected in the master comp are different versions of the text layer you're trying to change
for (var i = 1; i <= master.numLayers; i++) {
  var textVersion = master.layer(i),
      name = textVersion.property("Source Text").value,
      copy = template.duplicate();
  copy.name = name;
  // the layer you're changing is expected to be the top layer in the template LT
  copy.layer(1).property("Source Text").setValue(name);
}