This topic has been transplated from the Lr forum, and the primary question would seem to be "What would be the difference between calibration settings generated by CS(ACR2) running the Fors (Rags or Tinderman) script versus CS3(ACR4)?
In general, they should result in similar settings. And these settings should be usable in either environment. For example calibrate with CS3 ACR V4 and use the settings with DNG, CS, CS2, Lightroom, and/or Elements.
But, there have been changes with different levels of ACR, both globally and for specific camera models. So, there are no guarantees. YMMV. Whatever works best for you is what you should do.