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I don't know the exact hierarchy for Pioneer part numbers, but I can empirically assert that both the pouch and the battery door fit on all models.
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I don't know about the part numbers, but there are (at least) two different pouches:
The better (I think) higher-end pouch is stitched together, and is formed from a relatively complex vinyl material with a leather-like grain on the outside and a nylon-ish, fabric-like texture on the inside. I find these easier to use, as the calculator slides in and out smoothly.
The lower-end pouch (which I believe was consistently provided with the lower-end models like the 20S) has "welded" (melted-together) seams and is formed from a solid vinyl without a padded texture. I find these to be all but useless, as once the calculator is crammed all the way in, the slick vinyl inside grabs on and won't let go. (Maybe if I used one more regularly, it would expand and better serve its purpose, but I've not bothered to break one in.)
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Some Pioneer manuals part numbers:
- HP 20S: 00020-90001
- HP 21S: 00021-90043 (reorder number: 00021-90025)
- HP 22S: 00022-90016 (reorder number: 00022-90015)
- HP 32S: 00032-90040 (reorder number: 00032-90039)
- HP 32SII: 00032-90068
- HP 42S: 00042-90001
These are all English versions of the manuals.