Scale detection is an important skill when practicing and performing music. Getting familiar with each scale's unique sound, and the ability to identify them by ear is essential.
When comparing two scales, it's important to be aware of the differences between the two.
For example, when listening to a Major and Lydian scales, we should focus on the 4th degree, which is 1 semitone higher in the Lydian scale.
Listen carefully to the 4th degree in each of the scales: