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4 pin to 4 pin are available.
You are correct about 6 pin carrying power. The only other difference is that 6 pin is more robust.
Adaptors do work, but they also extend out and put weight on the small 4 pin socket. A little ungainly at the camera, especially. I'd hold out a little more for a 4-4. There is one line of good cable that is only 6-6 with adaptors that are on a short piece of cable, so, you don't have quite the strain a one-piece adaptor.
As for value, my reference is the TecNec 4-4 pin 75' at about $60 USD. Don't know the conversion for pounds or euro.
This is specialty gear, I wouldn't expect to find it at my local fine electronics retailer.
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