While both the IFV-6c Panther and IFV-6a Cheetah are based on the Israeli armored personnel carrier chassis, they each serve very distinct roles in combat. The Cheetah is a dedicated AA vehicle. The cargo space is taken up by ammunition storage for the vehicle's 35mm autocannons. It is also armed with air-to-air missiles and smoke grenade dischargers.
As with its parent vehicle the Panther, the Cheetah's chassis is based on the real-life "Namer" APC.
Its gun turret is a shared design that is also used by the ZSU-39, which in turn is based on the real-world "Marksman" anti-aircraft gun system.
However, because no anti-aircraft variant of the Namer actually exists, the Cheetah (at least in this configuration) has no direct real-world counterpart.
Its role and capabilities do bear some similarities to the real-life "Flugabwehrkanonenpanzer Gepard" SPAAG vehicle, which co-incidentally is also known as the "Anti-aircraft Cannon Tank Cheetah" in German.
Screenshots released during the pre-Alpha phase of ArmA 3's development indicated just like its parent vehicle, the Cheetah was also originally meant to be a CSAT vehicle. By the time of the Alpha and Beta's release however, it was eventually replaced in this role with the ZSU-39 Tigris.