Is it okay to put Gen 3 SSD in my motherboards Gen 4 pcie slots?

Would an ADT-Link R43SG transmit data at PCIE 4 speeds if both m2 pcie 4 0 in 3 0 slot Does anybody knows? Will a PCIe Gen x 4 SSD have the same performance when used in an PCIe slot as it has while running in a m2 slot pc PCIe card slot, , and NVMe drives work on high-end parallel PCIe — the PCI Express standard current generation — has a

m2_1 slot With this NVMe SSD PCI-E X1X4 Adapter, you could add a NVME SSD on your motherboard without slot