I would argue it is lesser. Most play music ha some variation to the theme but that’s it. A musical score has a lot of elements including lyrics and background scoring as well as individual songs.
This year it should have been reserved especially since it was a huge slap in the face for lightning thief. I don’t think lightning thief deserved a tony and I don’t think these scores reach any level of a movie score which does sometimes have a very memorable theme as Williams has proved with jaws and close encounters and many others. You hear Star Wars theme and you instantly know the world you are entering. I can’t say that about any of these plays.