Can I drive someone else's car if I don't have insurance on that car?

I drive a Honda Accord and have just minimum liability on it.

My brother drives a ford Mustang and he also has just minimum liability…

We are paying for our own car insurance but what if I drive his mustang and crash it will my insurance cover the costs or do I need to be added onto my brother insurance policy for the Mustang to be able to drive it?

Or just by having insurance I'm protected by driving any car?

I mean just for the other person car I crash not the damages to my own car I'm driving.

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