Save yourself a little money and order just the software. I'm calibrating a 2690WUXi with the puck that came with the APS it works fine.
The software can be hard to find, but the NEC site shows it to be in stock for $99.
I found the following on the NEWEGG.com website while searching for a good place to buy the NEC:
Other Thoughts: I'm a Professional Photographer. I purchased this monitor bundled with NEC Spectraview Color Sensor and software. There's a great deal going on in this monitor, it is professional grade kit. It uses very sophisticated hardware calabration, passed through your video card. The NEC Spectraview color sensor is made by Gretagmacbeth, but is modified by NEC to accept the expanded dynamic range of the monitor. None of this is apparent in the descriptions or on the NEC website. I spent over 6 months researching monitors, talking to graphics professionals, and this was the best match of value/quality. Purchased it two months ago.
***WindowsXP Pro, Intel QX6700 oc'ed to 3.47 GHz, 2GB OCZ DDR2 PC2-8500 Platinum SLI RAM, Evga 680i MoBoard, Evga GeForce 8800GTX, 2 ea Hitachi Deskstar 7K1000 Hard Drives, Antec Nine Hundred Case, PC P&C Silencer Quad 750, Thermalright Ultra-120, Artic Silver***http://www.newegg.com/Product/Product.aspx...N82E16824002169
This suggests that the pucks are not the same.
I have no clue as to whether this is good information. I pass it along as just another data point.