Check the distributors. My 1990 (Regina)and 1991 (Bosch Turbo) have the same, essentially empty, distributors. But the earlier 700s may have had some stuff, like a Hall-effect sensor or something in the dist. I've never had one, so don't know for sure. If the dists. are the same, that is a start.

As for the sensors, am not sure. Check the FAQ, and, later on I'll do the same (am busy right now). You may also want to check FCP Groton's web site. After you select your car's make, model, and year, then the type of parts you need, it will give you a choice of different types of the same part if the Regina and Bosch parts are different. For example, the in-tank fuel pump. It gives you a choice of one type for Bosch cars, and another for Regina. It is a quick and crude check to see if there are different parts, or if they are probably the same. Then I usually take the part number from FCP and use it in Tasca Volvo's site to see what a genuine Volvo dealer's site says. If still in doubt after that, I'll call up the local dealer and ask him.
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1955 Human, Scott; 1991 745 Turbo, Brunhilde; 1990 745GL, Snuggle Bunny