I did mine earlier this year, and can definitely vouch that the ABS sensor bracket will be on the wrong side. I think, from memory, that the brake pipe goes through it as well, so that'll definitely be wrong for the O/S.
The only other possible physical difference is the coil spring seat - have a look at what's on your vehicle at the moment: you may find the springs are handed (coil the opposite way to each other), and the N/S spring seat won't work with an O/S spring, if that makes sense?
I'm not sure on that last bit. I didn't replace the springs on mine, so what came off went back on again. To be honest, I'd send it back, insist they send you the correct shock and get your postage for sending the wrong one back to them.