Is the baluster spacing the same for the stair rail panel for RDI® Steel Railing?

Yes, but only when the stair section is level (0 degrees). MetalWorks Excalibur® steel stair rail panels are designed for installation at angles ranging from 0 to 41 degrees. The higher the pitch of the rail, the closer together the spacing becomes. At maximum pitch, baluster spacing becomes about 3”.