SSD , NVMe PCIe and NVMe PCIe which one is better

Can I Use a PCIe NVMe SSD in a PCIe Motherboard Slot? gen 4 nvme in gen 3 slot 3rd Gen Intel® Xeon® Scalable Processors • 32x DIMM slots • 4x ” SATASASNVMe • 4x ” NVMeSATA • 2x PCIe Gen 4 x16 slots, 2x FHFL • 1x OCP generous jack slot Yes, PCIe is both forwards and backwards compatible For example, this gen 4 NVMe SSD will work in a gen 3 PCIe slot, and a gen 3 NVMe SSD would also work

gengtoto slot 2 NVMe drive of 2280 sizing It has 4x PCIe