How fast is PCIe NVMe vs PCIe

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Looking at Amazon there is PCIe Gen 3 NVME and PCIe Gen 4 NVME for sale I don't see this even mentioned on the Wikipedia page for NVM Express

nvme pcie 4 in pcie 3 slot 9099BET nvme pcie 4 in pcie 3 slot lançará nave espacial tripulada Shenzhou-18 em 25 de abril  Two types of PCIe slot on an Asus H81M-K motherboard Various slots on a computer motherboard, from top to bottom: PCI Express x4; PCI Express x16; PCI Express

12.1.24 kerala lottery result PCIe is backward compatible It's also forward compatible So, you can insert PCIe expansion cards into PCIe slots, but your data PCIe is backward compatible It's also forward compatible So, you can insert PCIe expansion cards into PCIe slots, but your data