Today we have two AMD processors, one which came out in March and the other – in January of last year. Additionally, one of them doesn’t support Simultaneous multithreading, meaning it doesn’t support more threads than the number of Cores.

Both are a part of the Zen microarchitecture, which is a family of processors that first launched in 2017. The Ryzen 5 3500U is a part of the Zen+ which builds upon the original Zen style of the structure, on the other side, the Ryzen 3 4300U which uses the Zen 2 architecture, built on the brand new 7nm manufacturing process.
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https://laptopmedia.com/comparisons/amd-ryzen-3-4300u-vs-ryzen-5-3500u-zen-to-victory/