As long as the cylinder in the driver's side is the same type (i.e., it has the same number of pins) as the passenger's side, you can fix this problem. You will need to open both tumblers and then, using the "good" one as a model, determine the order in which the pins are arranged. Rearrange the pins in the driver's side tumbler to match and voila, you're a locksmith.
Best,
g
'64 230sl, fully sorted out...ooops, spoke too soon