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Hi Alex.
I'm a bit surprised like you are that the Volvo harness with a 7-pin round connector does need a converter. Somewhere in the lighting circuit you need either relays or transistors/diodes to combine the separate turn and brake lights for North American trailer lighting. No sign of that in that 940 accessory cable. Also no sign of that in the green manual for the "Pre-routed wiring for towing hook" diagram pages.
It would appear that the 940 accessory trailer cable is a Euro standard Type 12N round 7-pin trailer connector with ISO 1274 pinouts, having separate brake and turn signals, whereas in North America the similar SAE J2863 round 7-pin trailer connector is different and has combined brake/turn, just like the standard flat 4-pin connector. So there's why you need the converter and also why that harness is not commonly available in North America.
That Princess Auto part you quote is the trailer end 4-pin flat plug with LED indicator lights. The cheap non-powered converter I spotted online the other day was this one, except all of a sudden the price is double, so likely it was on sale or else in their Surplus section.
If you're going to be a purist about the wiring, go for a proper powered converter like the one I first linked to. Good going on finding the 10-pole connector housing and pins. Personally, I wouldn't spend any more time on it. You're likely going to be the only one who sees and cares about your handiwork hidden under the left storage hatch. If anything, solder is a better connection than pins, so hint, hint, snip, snip.
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Dave -still with 940's, prev 740/240/140/120 You'd think I'd have learned by now
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