Missing or wrong size crown race?

Roundi

The elastomers in my old RockShox forks have perished so I went to swap them out for my bike's original rigid forks. I took the caged bearings from the RockShox's crown race and found that the diameter of the cage looks too big for the rigid forks. They sit perfectly on the RockShox's crown race but not on the rigid fork. I was wondering, are the crown races different sizes or are the rigid forks actually missing their race?

Additional info: I found that the RockShox's steerer tube has an outside diameter of 28.5mm at the threaded section but is 29.9mm just above the crown race. My original fork's steerer tube is 28.5mm all the way down, which then increases to 29.94 mm at the step (not a race?!).