Hi, I recently got a Stiga DNA Hybrid H rubber from a source in China, I noticed that the rubber is 2.1mm, compared to 2.2mm that was directly bought from Stiga in Sweden. Is it known for there to be a difference? Packaging is also slightly different. I'm not really doubting it's authenticity, more so surprised that these rubbers have different variants, especially since you can't buy 2.1mm on Stigas own website?