This is what I remember reading on the Koni site- the yellows (SPORTS)provide more damping force and are externally adjustable. The reds need to be fully compressed and the shaft turned to adjust them (ie removed from the vehicle- PITA) and will not provide as much damping force for the equivalent setting.
The yellows also are low pressure gas shocks, the reds are of a different construction.
David
Mondeo ST24 Information Site yr 2000 silver Mondeo ST24 V6 MTX
mods: Custom alloy air intake using K&N RC-3250 air filter; Koni Sports shocks; rear 20mm Selbys sway bar; THF; EBC Greenstuff front pads, custom exhaust.