Different-sized colliders in Unity change the angular velocity

I’ve been working on adding different playable spaceships to Escape the Sector, but I’ve noticed this curious feature in Unity (I thought it was a bug at first!).

Watch this video:

Even though these 3 ships all have the same mass, angular velocity, drag and the same force is being applied, they turn at different rates because they have different sized colliders.

I assume this is normal, but it’s going to make it quite difficult to get the turning speed the same on them all without a lot of tweaking!