Some makers list compatibility but most say "All boards" or "North and Southbridges"
If it's glue on, it'll work, otherwise try to get a product image and see if it has the newer intel clips or the older pushpins.
Most likely whatever you buy will work for what you have.
If I didn't want to remove them easily later, I used to glue old 486 HSF's on northbridges, I'd lap them, put a thin layer of grease on, and four small dots of superglue on each corner of the NB.
Then I'd stack some weight on it to get it glued while clamped down for good head transfer.
More than likely whatever you get will work.
Abit used those HSF's in a number of boards in that era, they looked neat but the fans didn't last long at all and as you have seen are not simple 40mm replacements. Look at the HS itself too, not much surface area.
A replacement is a good idea.