"The two pieces of cloth exist, and they both bear the same blood."
Maybe they were from the same reinactment (public or private) and done with great realism. Mel Gibson wasn't the originator of passion plays.
Good heavens, there have been people in this modern age that have had themselves nailed to a cross and crucified. Didn't one die in the Phillipines or South America doing that? That's reinactment to the extreme.
I contend that it's nothing new now and probably wasn't new 150 yrs after Golgotha. And people are making money on it, when the real treasure is obeying the gospel (tagline).
That's a possibility. However, if so, we are returned to the idea of a polymath with knowledge of many aspects of Jewish customs, crucifixtion, Roman scourging, etc., who also had the means to creat an image on linen.
We also now have the problem of the unescapable fact that the Sudarion of Oviedo has a KNOWN provenance going back 1200 years... 600 years more than the known provenance of the Shroud.