It is all the same
EB1, EB2, EB3 are the categories
EB1-A, B, C are subcategories
Some Use EB1-1, or EB1-A, or EB1-EA(short form for Extraornidary Ability)
Similarly EB1-2, or EB-B, or EB1-OR (Outstanding Researcher)
Similarly EB1-3 or EB1-C, or EB1-Msomething (forgot)
Similarly in
EB2- NIW (Shortform of National Interest Waiver)
