The number doesn't have any use, other than to keep them separate. Module tags are basically names that you add to modules, so the game can neatly organise all the modules of an object into an array. For it to work, all the tags need to have a different name. But you aren't limited to ModuleTag_nn, you could name it ModuleTag_thisisatag or even SomeStupidName without the ModuleTag_ in it. They're just text strings, so they can have almost any name.
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what's the use of "ModuleTag"?
