Why Goku SSJ4 transformation has yellow eyes and Vegeta SSJ4 tranformation has blue eyes?


In Dragon Ball GT, Goku SSJ4 transformation has yellow eyes.

[![enter image description
here](https://i.stack.imgur.com/0wB87.jpg)](https://i.stack.imgur.com/0wB87.jpg)

But Vegeta SSJ4 transformation has blue eyes

[![enter image description
here](https://i.stack.imgur.com/WfDqC.jpg)](https://i.stack.imgur.com/WfDqC.jpg)

has there ever been an explanation why this is so? Do these transformations
have anything different or something?

