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The terms ADD and ADHD describe the same neurotype. "ADD" is an outdated term that once referred to people who struggled with focus but weren't hyperactive.
ADD (attention deficit disorder) is the term commonly used to describe a neurological condition with symptoms of inattention, distractibility, and poor working memory.
Attention deficit hyperactivity disorder (ADHD) and attention deficit disorder (ADD) appear to only differ by one letter in the names of the conditions.