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If there is no obvious difference then just put one on and see if it works like it should if it does leave it and if it doesnt then move it to the other side.
there is a cap on the end of the arm pop it off and take loose the nut and wiper arm will slide off with a little bit a persuasion and it does matter which one goes where the one with more of a bend is on the drivers side
The best way is to use a puller. You can either rent one from an auto parts store or buy one from Sears for about $20. If you pull on the arm you can bend or break the actuator arm its connected to.
there is a cap on the end of the arm pop it off and take loose the nut and wiper arm will slide off with a little bit a persuasion and it does matter which one goes where the one with more of a bend is on the drivers side