I know, it's a risk to connect wrong cable .. I know, because once I did it.. Luckily my Atari still live..
From this moment I use different cables (or mark red tape cable from power supply) .. Now it's OK..
I have in my Atari many upgrades (Rapidus, U1MB, VBXE, Second Pokey, Covox, Sio2BT), and I'm proud that my Atari still looks original..
Only differences it's a two little holes in a monitor socket
Otherwise it's a solution to protect..
Use a 8DIN socket and blind (glue) one hole.. 6 or 7 and use hole 8 to signal from blind hole..
Regards