Today we are putting the AMD Ryzen 3 4300U up against the Ryzen 7 3700U, and while the former came out in March of this year, the latter was introduced all the way back in January of last year. Both are from the Zen microarchitecture, with the Ryzen 3 4300U being in the new Zen 2 architecture, while the Ryzen 7 3700U is in the Zen+. Another difference that comes from the architecture of the processors is that the Zen 2 has a 7nm fabrication while the Zen+ has a 12nm version. It may not seem like much, but that difference allows the Zen 2 to rise in temperature slower, making it take more to overheat.
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https://laptopmedia.com/comparisons/amd-ryzen-3-4300u-vs-ryzen-7-3700u-last-years-champ-is-todays-nothing-special/