I know that the EASA IR test includes NDB procedures which aren't part of the FAA test
I'm not sure where people are getting this but I definitely have done NDB procedures in my FAA flight test, both an NDB hold and and NDB approach.
Obviously, if your aircraft is not equipped with an ADF then you won't perform NDB procedures on an FAA test, and I have heard some schools sticking INOP stickers on ADFs so that the students don't have to deal with them, but you CAN still be tested on NDBs in the US, and many examiners still test them.