Seems you found the official package which should work to update v2.1's IDE stack (for large drive support and such) as well as support IDE CD's and even DVD's formatted as a CD. I can't remember if you also need the CDFS.IFS to read CD's but probably not as v2.1 did support some CD players. Probably good to update as well
I'm not sure if you have to manually add the drivers to config.sys, but if you do, ask.
Generally most device drivers are compatible with OS/2 2.0+ though they might need unpacking with lxlite as Warp V3 introduced more efficient program compression.
You can also replace various parts of the IBM stack with Dani's, available in the same directory at Hobbes. I'd advise starting out with the official IBM stuff to keep it simple.