Incandescent bulbs have a different colour spectrum than white LEDs. You should select LEDs based on the colour of the lens that covers the bulb. The easy general rule is that the LED bulb should match the colour of the lens.
Depending on the application, a clear lens can be used with either a white or an amber bulb.
The red lens should always be paired with a red LED. The light will appear pink/orange if you place a white LED behind a red tail/brake lens.
An amber LED bulb should always be used behind an amber lens. In the presence of an amber lens and a white LED, the light will appear green.