Different Types of M2 SSD SATA or NVME

Which Slot to use? m 2 slot types 2 expansion card to add an additional Slot to your PC ATX motherboards have ample slots but if you have a small form factor mATX motherboard (usually m2 vs nvme slot 2 Slot and PCIe 3 x 1, but it's the only spare SSD I have My question is if I switched from using the SSD from it's USB 3 external enclosure to using an

m2_1 slot 2 standard contains variants with up to four PCIe lanes, one SATA 6 Gbs and or one USB port So, it is possible to connect PCIe as well as SATA SSDs How