Euro tail lights, also known as Altezza or clear tail lights are a popular styling accessory for late model cars and trucks. They're sought after replacements for the factory installed tail lights, which usually have plain, boring red plastic lenses. In contrast, Euro tail lights present an interesting chrome or black substrate with smaller red, clear or yellow individual lenses or bulbs under a clear or smoked outer lens. With so many potential combinations of colors, tints and bulb/lens arrangements, it's no surprise that there are many Euro tail light styles to choose from and many manufacturers offer multiples styles for one model vehicle. Euro tail lights present an excellent opportunity to personalize your vehicle. However, the important thing to remember as it relates to the original question is that Euro tail lights are a style of tail light.
An LED tail light, on the other hand, refers to the type of light source for the tail light, in this case LEDs (Light Emitting Diodes) rather than traditional incandescent bulbs. LED lights have become popular for automotive lighting use because they have many advantages over incandescent bulbs. LEDs last much longer and consume less power than incandescent bulbs. They're also extremely vibration resistant, a definite plus for vehicles that must traverse today's pothole strewn roads. But one feature makes LEDs particularly appropriate for tail light/stop light use: LEDs rise to their full intensity approximately 200 milliseconds faster than incandescent bulbs.
This may not sound like a lot of time, but it may only be a split second that's needed for the driver behind you to see your stop lights and react to avoid an accident.
Since LEDs are much smaller than incandescent bulbs, they're always grouped together in a fixture to provide the necessary degree of lighting. Because the LEDs are usually arranged in an attractive pattern under a smoke or clear lens, some lighting manufacturers may refer to these as Euro LED tail lights.
In conclusion, Euro tail lights are a style of tail light and their light source can be incandescent or LED bulbs. LED tail lights use LEDs for their light source, and some manufacturers may refer to them as Euro LED tail lights.