WFU connector

[Farside]

Are the 7-pin connectors between power source and WFU a standard, or is each maker different?
I have my Butters box and when I single-phase convert it (assuming it's even possible) I want to connect a TechArc F40 WFU to it. Each of them has a 7-pin connector.

 

[Robotstar5]

Unlikely they will be compatible to stop you using a cheaper competitors bit of kit?

 

[Farside]

Unlikely they will be compatible to stop you using a cheaper competitors bit of kit?

This is what I'm wondering - the likes of Tech-Arc and others selling what seems to be a fairly universal replacement WFU, seems to point to a standard connector, but it could be the one I've got isn't, iyswim. I haven't a clue where mine came from or what it was used for, or what it was originally paired with. I suppose an email to Tech-Arc is in order, and hope they've got some records they can look up from a serial / type number.
In the meantime I'll see about picking up a 7-core cable with Amphenol connectors and keep it for later - one more step along the way.