Bests & Worsts Reviews from Amazon

I bought the Merv 8 and the Merv 13 version of these. The Merv 13 is TWICE the cost. However, the two sets of filters I received are identical in every way, even down to the QR code on the side. The only difference is the sheet slid into the plastic wrap. One says it's the Merv 13, and one says it's the Merv 8. It seems logical that these would look the slightest bit different if they were in fact different.