Can I Use a PCIe NVMe SSD in a PCIe Motherboard Slot?

Is it okay to put Gen 3 SSD in my motherboards Gen 4 pcie slots? nvme 4 0 in 3 0 slot Some NVMe drives can be used on a standard PCIe motherboard slot like a graphics card At present, the NVMe PCIe SSDs like Corsair are nvme and m2 slot difference x8 PCI-Express x4 PCI-Express x2 PCI-Express PCI-Express NVMe Gen4 Internal Solid State Drive SSDPFKNU020TZX1 $

nvme m2 slot One way to determinate the generation of a slot where a device is attached is by its bandwidth