I know Google punishes duplicate content in searches, like two web pages containing the same content. That being said, I have not bothered to re-title my track on various online libraries. It is a lot of work to track different variations on my paperwork, and there doesn’t seem to be enough benefit. I will alter the descriptions a bit depending on the field requirements of the library.
Other times I change the track title because of the way the music was submitted. For example, AJ allows you to bundle track variations into a .zip file, but P5 only takes single tracks. In this case, I’d upload the compiled zip to AJ under one title, and the different variations to P5 with more specific titles to note the differences in instrumentation, etc.