1987 Honda Accord Radiator and alternator

do they have the same motor? if so the alternator should be the same. as far as the radiator you just have to ask the parts store if the part numbers are the same for both vehicles

Look up the parts on an automotive web site to see if the same part numbers are listed for both applications. I use the Rock Auto web site quite often. I looked up the generators for you. They have different part numbers and different mounting ear shapes. The connectors will be in different locations, but other than that it's impossible to know if the wrong generator will bolt to your car. Even if it does, the mounting ear that's different will likely relocate the pulley making the belt too short.

The inlet and outlet tubes are 4mm larger on the Prelude radiator. The other dimensions appear to be the same. You'll have to compare the two to see if the wrong one can be made to work.