I don't think anyone here has any idea what you're even asking?

 

one opinion about sparks denso 5062(JCW 2009 sparks), on a mini S 2009

 

According to this chart, they are not colder. They are the exact same heat range, once you do the conversion between both brands. You would need the equivalent of a Denso spark plug with a heat range of 24 or NGK 8 to be one heat range colder than stock.

http://www.sparkplugs.com/more_info.asp?AAIA=&pid=9660
Denso Heat Range 22

http://www.sparkplugs.com/more_info.asp?AAIA=&pid=27208
NGK Heat Range 7-OEM spark plug on Cooper S and Cooper JCW

 

If you change to non oem plugs be sure to check the torque on a regular basis. You wouldn't want a spark plug flying out of your head.

 

was a very common problem on the 53's...