Executive board, at least on my journal, includes the editor-in-chief, the executive articles editor, the executive managing editor (who oversees cite-checking), and the executive notes and comment editor.
All of these positions (except EIC who oversees everyone) have all the other 3L journal staff working for them. So if you're just a regular articles editor, you're probably not considered an executive board member. You're considered a regular board member, or staff member.