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The NA versions replace the quad-core Exynos with Qualcomm's S4 (dual-core). The reason for that is that Qualcomm's S4 is the only chipset available with integrated LTE. The Exynos, like the Tegra 3, is based on the older ARM9 architecture, whereas the S4 is based on the newer A15 architecture. Although it only has 2 cores, the S4 is noticeably faster than a dual-core ARM9, and in some aspects it beats the quad-core Tegra 3. The Exynos is supposed to be faster than the Tegra 3, so it will probably be ahead of the S4 in most if not all benchmarks. However, benchmarks are just that, benchmarks, when it comes to every day use, I pretty much doubt you'll be able to tell the difference between the S4 and the Exynos. Besides, the NA version (S4) comes with 2GB RAM, which for most people is more beneficial than having a quad-core. Another advantage of the S4 is that it is manufactured using a 28nm process (as opposed to 32nm for the Exynos and 40nm for the Tegra 3), which means it is more power efficient.
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