Really trying to understand where you're getting this. Do you have something you were reading that has all this incorrect information, or is it just based on what Samsung phones traditionally have done out of the box or something else?
To try to make this as brief as possible, there are very few real differences in LCD vs *LED displays. The main difference is how the display is lit. LCDs have a backlight that turns on all pixels all the time while *LED displays turn on only pixels that need to display colors that are not black. LEDs also have the advantage of being able to be individually dimmed or brightened to enhance the accuracy of colors being produced with RGB sub pixels.
But, there are no inherent color differences in the displays. That's all up to the color mode and calibration of the display in each mode. Or, as we go into devices shipping with Android O, the OS will dictate exactly which colors will be displayed through OS level color management. An LCD and LED display that are calibrated exactly the same will display exactly the same colors. One will not be skewed or shifted by the nature of the type of display, aside from any production errors in the panel itself.
Currently the most accurate display on the market is the iPhone 7/7+, which is an LCD. The second and third most accurate are both Samsung devices, the S8/S8+ and the S7/S7 Edge, which are both AMOLED. The only reason the iPhone is winning that battle is because Apple took the time to individually calibrate each display as perfectly as possible.
It is impossible to look at only the type of display and make any correct assumption about which one will have more accurate colors.