Gen 4 SSD on Gen 3 slots Desktop Computing -

What is the difference between PCIe Gen 3 and PCIe Gen 4? can i use gen 4 nvme in gen 3 slot 2 NVMe drive of 2280 sizing It has 4x PCIe can you make a living playing slot machines Testing and installing a Gen4 NVME SSD on a Gen3 Motherboard This includes Unboxing

can slot machines be manipulated As far as I know both PCI-e slots and devices are backwards compatible A PCI-e nvme will work on a pci-e slot as far as I know