Looking at the fire up video of the Scuderia Ferrari SF21 car we can notice that it retains the SF1000 roll structure, but has additional cooling ducts either side. These likely feed air to a new transmission cooler mounted on the centre line of the car.
Scuderia Ferrari is said to be using a new, narrower, transmission casing, which is likely to be the reason for the cooling layout change. The homologation rules mean that the roll hoop has to remain the same as it would be a token spend to change it, but the ducting around it is free.
The A shaped roll hoop looks a bit more curvy. Likely a result of the new plenum on the V6. While the aluminium roll hoop structure must be carried over from the Ferrari SF1000 car (with the rest of the tub) the shrouding on it counts as bodywork and can be altered.
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