In reply to KTS915.

On my tests, any duplicated handle name will not be printed by WordPress. So the first one that was enqueued by any of the plugins will be taken into consideration.

If the handle name is different, then it will be printed even if the URL to the script/style is exactly the same.

Any plugin/theme developer with common sense should use unique names for the handlers anyway, so I don't see in this to be a problem at all.