My question is, what is the difference between Wireless-AC 7260.HMWWB and 7260.HMWWB.R?
I have found a document which says it is just a renamed modell. https://qdms.intel.com/dm/i.aspx/CC049656-390A-45B4-8291-AC6E85530DCF/PCN113028-02.pdf https://qdms.intel.com/dm/i.aspx/CC049656-390A-45B4-8291-AC6E85530DCF/PCN113028-02.pdf
Does 7260.HMWWB.R have some improvements or why is it more expensive?
Is there an specific reason you need this information?
Before we go any further, we would like to inform you that Intel does not support integration which is when the original wireless card is replaced for another one. Please check this link for further information: http://www.intel.com/support/wireless/wlan/sb/cs-011644.htm Intel® Wi-Fi Products — Regulatory Information Regarding Hardware Installation or Upgrade
If you are planning to change your wireless card for one of those you have mentioned, please contact your OEM as they are the only ones entitled to provide a list of compatible adapters.