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Yes, when it comes to engine related parts of the diagram, I can imagine that there will be differences, but not when it comes to stuff that is shared between the models, like lighting.
In this case the white/black wires in the diagram ("W-SB") to the front fog lights correspond to the colours mentioned by BrickBob. If it hadn't, I'd have left it well alone.
The diagram also shows the fog light switch and relay and the violet/white wire between them.
Most of the links to Volvo manuals have disappeared from the net. You now have to make do with what you can find and see if it is applicable to your model year. More often than not, it is, even though, strictly speaking, it isn't. Volvo didn't set out to change wiring looms every year. But yeah, caution is advised.
I often revert to looking at the '86 diagrams for my '92 245, because they are far more legible in the Haynes manual, and I find the shared stuff is identical, right down to colours, etc. And I see you're using an '89 diagram to answer questions for a '91.
Again, I'm not saying this is always the case.
BTW, this document (TP31075/1) is from Volvo North America Corporation.
This manual not only deals with the B280F equipped car, but also the B230FT, differences between the two are clearly listed.
Bill linked to wiring harnesses that did not show light circuits, so did not provide any answer.
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