A20A3 Vs B20A3 transmission compatability

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WHat is the differance between a A20a3 and a B20a3? I have a '86 prelude that I race dirt track with and need a new transmission, tore up the main shaft on the original. They guy I bought it from put a A20A3 Accord motor in the car and I need to know what transmissions will fit it.
 
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