Are you using lasers?
With the wheels dead ahead the laser should cross the horizontal lines (camber) the same each side. If the camber is the same each side, and the pills are not 180deg back to front, then your caster should be the same.
You can check that it is the same by steering the wheels through a defined angle and remeasuring the camber. If the grid on the lasers is big enough and the amount of caster large enough, it is probably measurable by steering the laser to the last grid line each side. Steer to the right until the laser is at the edge of the grid, note the camber. Steer to the left until the laser is at the edge of the grid and note the camber.
All this assumes everything is straight and correcly aligned and centred to start with.
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