I don’t know what you imagine when saying Spec A and B, but it does not necessarily mean bringing a completely new car.
The talk of the current car being a baseline version is correct and was confirmed by Hamilton:
With the baseline car we have, we’re still trying to test different solutions. We are still looking for the ideal operating window. We’ll need to handle it carefully. Also, it’s the first day here, and mornings are never the most enjoyable. But overall, as I mentioned in the last test, it’s a more fun car to drive.

