Can I removed my DVD Drive and replace into a MXM in a 15

There is no MXM connector in this logic board If you watch the video of the newer 2017 27 iMac Retina 5k model you would see its the same!

MxM slot and the size of the head that is plugged into the slot looks like was made to MxM type A MxM is an pcie interface directly

bb slot Mobile PCI Express Module: Smaller, Upgradable GPUs The basic premise of the MXM form factor is simple

slot novomatic Features MXM type A supported; SATA-600; LVDS, VGA, HDMI, and DisplayPort; 4 USB and 2 USB ; 2 PCI Express Mini Card slots; 3 RS-232422485 and 1