Every add-on connector is keyed to one host. Pi 40-pin HATs, Arduino shields, and Adafruit FeatherWings are not interchangeable — the same motor driver or display will often exist in all three formats, sold as different products.
About 270 add-ons across Pi HATs, Arduino shields, and FeatherWings. The same function — motor control, PoE, display — usually ships once per host connector family. Get the host board right first.