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Here is info from my Haynes manual, Volvo 120 and 1800 series:
B18A: Bosch JFR4 (vacumn advance)
B18B/D Bosch JFUR4 (centrifugal advance)
B20A/B Bosch JFUR4 (no idea if it's vacumn advance or retard)
B20E/F Bosch JFURX4 (vacumn retard)
I'm not sure how accurate this info is, but that's what is printed in the manual. When I look at the illustrations in the manual, the distributor for the B18 B/D looks different than the distributor for the B20 A/B, yet they are both listed as JFUR4. Sorry, I don't have listing of #'s which appear on oval plate (that is riveted to dizzy)
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