Compare SSD , mSATA, , SATA Express -

m2 sata slot   Dan m2 pcie 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

So if you try to use a PCI-E drive in a SATA-only slot it will not function correctly PCI-E drives should really be 2 drives are “keyed” at one end so as to prevent the end-user from inserting them in an incompatible socket PCIe NVMe drives are 'M' keyed SATA ones,

jellyfish flow slot 2 slots will support both SATA and NVMe SSDs Make sure to check what SSD technology your motherboard can support Advantages: BEYIMEI to SATA Adapter, NGFF SSD to sata III ssd Drives, Connector Converter Expansion Card for SATA III, Supports NGFF SATA 2280, 2260,