No, the assegai spear is your typical long spear used for throwing. Where the iklwa is a long bladed short spear used with a shield for close combat.
Shakas weapon was the Ixwa or iklwa depending on if you can pronounce the click. It is a short staffed stabbing spear with a broad and elongated head.
The Iklwa (Zulu} which is a short stabbing spear with a large and long blade (18 - 30 inches in length) and a hardwood shaft of an African wood, most often Thanboti. It is the weapon chosen by Shaka.