Rewiring old Brinks keypad with 8 wires to Ring keypad

Hi everyone! I have an old Brinks keypad that has two main wires that each break apart into four wires each coming into the keypad (see photo). I bought the dc/dc converter also in picture. Questions… 1. Is this the correct converter that I need? 2. Do I combine the two black wires from the old system with the black wire from the converter together and then the two red wires from old system to the red wire from the converter together? 3. What do I do with the other wires? (blue yellow brown and green ones) I wasn’t expecting all these extra wires compared to other similar posts. Thank you so much for your help!