Difference (apart from the price) between item 15823149 and item 14158638? Both Logitech K380, white, Quartz CH but partly other (Ambiance) pictures deposited. digitec.ch gives 'chiclet' once and 'membrane' once as the construction, but at logitech.com there is absolutely no information about the construction type and only one variant in each case (apart from colour variants and corresponding keyboard layouts). In addition, 'chiclet' is actually a 'rubber membrane' that transfers typing to the keyboard's circuit board.... Help, as a layman I am already a bit confused...