Technically yes, but how the factory did it was have weight removed from the "pin end" to compensate for the heavier "bob weight" that would exist on the 340, a bored hole in position 1/2 and 7/8 throw of the crank.
In other words, the forged crankshafts for the 273, 318, and 340 are all the same basic forging and strength, just the manner of balancing differentiates them?