That axle you received is a non-abs axle by the looks of it. I have never seen one to comment on the flange end with the extended raised surface on it. I thought the only BNR32's that came factory without ABS were N1 and Nismo models. You definitely need to replace your axle with an ABS compliant axle if you still have ABS on your car. If you managed to install that axle, the ABS system would see the left front tire as being locked up, and this will either throw a code or cause braking issues.
In a normal case, I would recommend that you bring your original axle to a shop to be rebuilt, but the cv cup seems to be broken and can't be rebuilt in the states. At this point, it looks like you will need to get another axle with ABS.
In your photo showing the replacement axle's hub spline end, the axle cup looks way different. It almost appears to not even be for a GTR in the first place. The reason I say this is because there isn't a smooth step up section immediately after the splines, and this is required to slot into the wheel bearing seal on the backside of the hub that keeps dirt and grime out of the bearing. In fact, I am almost positive that the replacement axle you have is a REAR axle. I have my old S14 rear axles laying in the shop that are a match on both ends to your photo. They even have the raised center on the mounting flange end. It looks like you will need to work out a dispute with your Aus seller, because that is definitely a rear axle you are trying to install.
The below URL shows S14 rear axles that look like what you received.
http://zilvia.net/f/showthread.php?t=341310