I was a lighting designer for several years and in that time in don't think I ever saw a proper 5-pin DMX512 connector. Even in venues with millions in house lights, the connection backstage to the house was XLR.
The proper DMX512 connector is XLR, though? The 5-pin variant, that is.
I worked as a tech at a stage for a short while. We always used XLR5 for lighting and XLR3 for audio.
Yes, I only saw 3-pin XLR for DMX512, while being aware of 5-pin XLR as "correct". Everything from the lighting console, to dimmer packs and moving heads, to the aforementioned connection to house lights. This was 2009-2013. Maybe it was regional?
Technically DMX needs 110 ohm cable - the connector is less relevant. But most DMX devices are forgiving, and will accept whatever rubbish cable you throw its way.
It's the same thing as USB-C, actually. The connector looks the same, but the cable can vary a lot. At least audio cables are labelled.