Technically, yes. However, if you listen closely, you will find lots of details that speak for a typical IT / XM module of that era, e.g. wild ping-pong panning envelopes that would be extremely tedious to do in MOD / S3M and in particular would not allow for any other commands to be used at the same time. In practice that means that it's unlikely that they are MOD / S3M files.
But it doesn't really matter because I doubt that anyone is going to go through the entirety of all XM / IT files from that era on TMA to look for the originals. A much more promising attempt would be to identify a set of potential authors based on the style of the tracks and then download all their stuff and compare it.