The 737-800s operated by my company have load relief at 10, 15, 25, 30, and 40 flap positions. At flaps 15 the flaps will move to 10 if airspeed reaches 201 knots.
These airplanes have the short field performance feature, where the leading edge devices do not fully extend until more than flaps 25 is selected.
737-800 that I flew at a previous carrier ten years ago did not have this feature nor the load relief at flap positions other than 30 or 40.