This is a very important question. Although USB drives and SD Cards use similar hardware for data storage, SD Cards require a slightly deeper understanding, particularly with regards to use in printers, MFP, AIOs etc.
Slot Width And SD Card Width
SD Cards are fully inserted into the devices, so their width must match with the width of the slot.
A smaller card can be placed in an adapter to match the larger slot size.
Using an SD Card in a microSD slot also requires an adapter but here, the microSD side of the adapter will go into the slot while at the other end is a flat cable that connects to the SD card which will hang outside.
SD Card Type
SD card have evolved overtime and so are available in various types that may or may not be compatible. We talked about this earlier in the article.
SD Card Speeds
Associated with SD Card types is also the speed. The Types of SD cards partially overlap with regards to speed. Again, compatibility must be confirmed.