Yeah...the IHKA is the "digital/automatic" control panel...and the IHKR is the "manually regulated" semi automatic control panel. Below is more info about the e39/e53 IHKR for those that are unfamiliar with it since it had a limited availability in the US market. BMW NA marketing only offered it on base models and only in certain model years:

__________________
Become a BMW CCA member! Click HERE to join and feel free to use my BMW CCA member #191509 as a referral.

• 2015 f06 650ix GC (Moonstone exterior/Cohiba brown Merino Leather interior)
• 2014 f15 X5 50i (Space Gray exterior/Mocha Nappa Leather interior)