TSMC is the other. TSMC is using its 3nm process, reportedly, while Samsung will do a 2nm as a litmus test for the process. The different versions are due to the fact that 'they translate designs to physical form differently,' CEO Elon Musk said recently. The goal is for the two to operate identically, obviously, which is a challenge. Some might remember Apple's A9 'Chipgate' saga, which found that the chips differed in performance because of different manufacturers.
The 2600 will use the new Heat Pass Block element, which will help remove more heat from the silicon. The Exynos 2600 has been spotted on Geekbench a couple of times with the more recent scores looking quite promising. The Xclipse 960 GPU has also been benchmarked and it might beat Qualcomm's GPU in the Snapdragon 8 Elite Gen 5.