We are frequently asked the difference between these parts, as they look nearly identical, as seen in the side-by-side comparison below.
The datasheets show that the primary difference between these two parts is the delay time, with the 6026137(1882-6026137-ND) having a delay time of 0-50s and the 6026136(1882-6026136-ND) having a delay time of 0-5s.