I did spend some time last night trying to work out the point group and whether they were chiral but it has been a long time since I studied symmetry. They are definitely chiral and I think C2V. They have rotational symmetry around the axis.
Either way the left pedal is a reflection of the right so they cannot be superimposed. As above the chamfer would be wrong. Look at the leading edge and the upper part is further forwards than the bottom. If you swapped for the other axle and put it on the other side the lower part would be further forward.
While the axles will go in they only go in from one side so this would not solve the problem.
I find it interesting that the pedals are designed this way. If I was doing it I’d make the bodies identical so that you had less SKUs, only the axle would be different.