1) Your Disco connector has 6 pins:
1 - Not used
2 - Sync (negative composite)
3 - Ground
4 - Blue
5 - Green
6 - Red
2) The G07 has a 6-pin and 3-pin connector, and would be connected this way:
1 - Red
2 - Green
3 - Blue
4 - Ground
5 - Not Used
6 - Not Used
1 - Not Used
2 - Sync (negative composite)
3 - Sync (negative composite)
Connect the sync to both pins.
3) The K4900 has a 10-pin connector (with one missing) and would be connected this way:
1 - Red
2 - Green
3 - Blue
4 - Ground
5 - Not Used
6 - Not Used
7 - No Pin
8 - Not Used
9 - Not Used
10 - Sync (negative composite)