See post #51, it has the same curve shape. It might be useful to look at the grain structure of the two as well as if they both dry the same way.
For me personally, I don’t care one way or the other. If it really is GP3, then catLABS is supporting film and giving others an opportunity to help support them by buying it. It’s no different than what freestyle is doing with their Arista.EDU line (which is fins film), what you also see with Holga film (which is also Foma film). If you don’t want to support an outfit or company, then don’t buy it, otherwise do your part to support them.