IIRC the mali drivers still do not support the buffer_storage extension dolphin pretty much requires for good performance - on any version.
That may change in the future, but even if new drivers do start supporting it, that's no guarantee those driver updates will make it to current devices, or even those released soon after the driver support was added (device design cycles can be long, and often end up pulling in a driver well before the public release date).
So I guess the answer is "no" right now - the snapdragon will likely be faster than and mali-based exynos.
That may change in the future, but even if new drivers do start supporting it, that's no guarantee those driver updates will make it to current devices, or even those released soon after the driver support was added (device design cycles can be long, and often end up pulling in a driver well before the public release date).
So I guess the answer is "no" right now - the snapdragon will likely be faster than and mali-based exynos.