The speed of light, as described by Einstein's theory of special relativity, is considered to be a fundamental constant of nature. According to this theory, the speed of light in a vacuum, denoted by 'c,' is the same for all observers regardless of their relative motion. This principle is known as the constancy of the speed of light.
The constancy of the speed of light is not dependent on the specific universe in which it is measured. It is a fundamental property of spacetime itself. Whether in our universe or any hypothetical alternate universes, the speed of light would remain constant as long as we are within the realm of spacetime governed by the same laws of physics.
It's important to note that our understanding of the behavior of light and the constancy of its speed is based on experimental evidence and extensive observations. However, if we were to consider completely different physical laws or properties in another universe that significantly deviate from our understanding of physics, it is difficult to make definitive statements about the behavior of light or any other fundamental constants. Speculating about universes with entirely different physical laws goes beyond the realm of our current scientific knowledge.