You will need to find (or create) a list, that shows how the pinout of the connectors on the SD card board.
Then you need to pair the pins to the AUX-3 pins on the RAMPS 1.4 shield.
And finally you need to decide on how to connect/solder the wires together.
The easy solution for you, would be if someone already had a LCD adapter, with an extra 10-pin socket on it, so it would be possible to connect both the RRD LCD and the MKS SD card connector. But I doubt such a thing exists. So perhaps you might want to try to design one yourself?