I have a 55-Amp Bosch from a 1981 240 and a 80-Amp from an unknown year 700 on my work bench. The front frame mounting lugs are identical and look to be spaced the same distance from the front pulley. Both units have 2-sheave pulleys although I thought the 700's only used a single drive belt. The B+ and D+ connectors on the rear frame of the units are very close to being in the same place.
Based on this, I would say that the units are externally identical and can be swapped. I expect this applies to your 1988 240 alternator. The output rating of the 240 might be a bit lower, but not enough to affect normal operation.
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Bob: Son's XC70, my 83 244DL, 89 745 (V8), 98 S90, and XC60. Also '77 MGB and some old motorcycles
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