There are several select differences between them, their height the chief difference so far. More will be mentioned in the future, but for now know that none of the smols in my story that are like Walt Watch will ever come close to six inches in height. Four inches is tall for them, and four and a quarter would likely be close to their tallest.
“Borrowers” and “littles” are just names applied to them by humans over the years, and they don’t see the point in arguing against them. They’ve lost the memory of where they came from.