Well it does for Delta's revenue based earnings. Tickets on 006 earn based on $ whereas tickets on partner stock earn based on fare class and distance flown.
While I've read this a few places, I've never seen it backed up with Delta's published policies.
From what I can tell, all DL-marketed flights earn spend-based miles, except for special fares
listed here.
According to the
terms at the bottom,
Flights marketed and ticketed by Delta’s partner airlines will earn miles based on a percentage of distance flown as determined by the fare class paid as published at delta.com/partnerairlines at the time of travel.
For itineraries ticketed by Delta’s partner airlines that contain both partner-marketed segments and Delta-marketed segments, the partner-marketed segments will earn miles based on a percentage of the distance flown as determined by the fare class paid as published at delta.com/partnerairlines at the time of travel, and the Delta-marketed segments will earn miles based on the total base fare and carrier-imposed surcharges prorated as a percentage of total distance flown.
DLXXXX flight always has fare/spend based RDM, even on non-006 stock
Partner flights on 006/DL stock earn DL's fare/spend RDM amounts
Partner flights on NON-DL stock earn partner distance-based miles
So the challenge is to get KLxxxx on non-006 stock if the distance-based earning is better. You could try 016/UA stock for free, but I'm not sure if they have access to all of KL's inventory.