VE6 XC is a Cross over change/adjustment, so the answer is "NO" it is not the same.
The "R" option on the Noble CIEMs is not a "cross over" change/adjustment either. There is an actuall addtional "Reference" type driver added to the CIEM.
For example:
One can place an order for a 3C + "R" which means 3 drivers + 1 Reference. (a total of 4 within the CIEM housing)
When the switch is activated, the 3 drivers are turned off, the signal from your dap, is then transfered to the "R" driver and the CIEMs are now in "R" mode.
This IS NOT a X-over adjustment, this is really TWO products in ONE housing.
and in theory, with the IEMs, if you add a resistance adaptor, you now have 4 products in one housing (kind of mind boggling)