lego hahaha indexed. My experience with the sidewinder was 1/3 of the jst 3.5mm sockets on the board had Dupont connectors in them. Held in with hotmelt glue. When I removed the glue because my OCD have a kitten and removed and replaced with the correct connector that indexed on one stepper. I lost tract of which black wire was which. How I know if you reverse the connection it runs backwards…
I was drawing on my experience. I never stopped to consider it might not have been assembled in the dark by people who jammed the round peg in the square hole.
I assumed anything is possible.
Indexed connectors ? Then the have to match, where is the fun in that?