I can't remember the difference of the two Caster kits.
Was it the thickness of the mounting plate which would change the height based on the Wheel Assembly being used?
The base of the Arlo Caster Assembly is 1/8 inch thicker than the Eddie Caster Base.
When I replaced my Eddie Motor/Wheel assemblies with the Arlo Motor/Wheel assemblies I had to insert three 1/8 inch aluminum spacers at each corner of the Caster Bases to get the robot chassis to balance.
Not to be confused with the new in 2022 Caster Wheel Kit!!!