are the same thing. They have the same artist and author, and you can see here that the formal title of Sword Art Online 4-koma is "Sword Art Online." This works fine in japanese, with hiragana and katakana, but in English, the only difference is a period at the end. That's awkward. So, I suggest combining the two under the name "Sword Art Online 4koma" and leaving "Sword Art Online." as an associated name.