Mine are the same as the black one. I was going to grind the swege (swelled area) off the studs, but I plan to replace with disc brakes soon, so I haven't messed with it. Basically, the factory studs had a swell to them to hold the drum onto the hub. You need to cut or grind that off to make the drum removable like the red one in your picture.
You don't want to drive them out of the hub without doing that because that swelled area will remove material from the hub as you are driving them out and holes for the new studs will be too large to press new studs into. Only option then is to weld the new studs back in, which many have had to do.
I've heard of people driving the hub out of the drum, then use a hole saw that has the right inside diameter to just cut off that swelled portion. The other option is to cut the old studs off flush to the face of the hub, then drive them out.
