It sure isn’t an XP-G3. Thanks
Usually. It’s easier if your trying to decide between 2 models, like a Cree XP-G3 or a Luminus SST-20.
Here is an SST-20.
Here is an XP-G3.
If you have no idea what it is, then it’s tougher. Most folks here can identify the more common leds by sight, but if it’s odd or really old it can be quite dificult. Here is a reference guide.
Post a picture if you have one along with all the info you have such as the model of flashlight and how old it is.
If you mean identify the tint, then no. It’s a lot more complicated. Warmer tints tend to have a darker yellow or orange looking die while cooler tints have a lighter yellow die. It helps to shine it on a white wall. To know exactly the tint requires a special device that can sample the light output and analyze it.