Advancement stage and skill quality are not the same concept. Advancement means progressing to a higher stage of a job line, while skill quality and enhancement are the axis for growing individual skills.
Changes Confirmed Through Advancement
New skills may be unlocked in a higher job, and the job's traits may change. Existing skills can continue to be used within the same line. Analysis of the provided APK did not confirm a rule by which advancement alone automatically replaces existing skill IDs or automatically raises the quality of all skills.
Why the Same Skill Can Produce Different Results
The skill's own quality and enhancement stage, character growth, equipment and job traits, and other skills equipped together affect the result. Using a skill with the same name does not always produce the same damage or survivability effect.
Items to Check If an Effect Has Changed
- Check whether it is the same skill ID.
- Check the quality and enhancement conditions and any additional conditions added to the description.
- Check the influence of the new job's traits or passives used together.
- Check whether the guide's service region and applied patch are the same.
Whether hit count, targets, or additional effects have actually changed must be checked per skill. Do not generalize this into a common rule that all existing skills automatically evolve upon advancement.
Sources: the official APK's job and skill settings, and Purrwikimania's skill materials by quality.
Translated from the Korean original. Check the original service region and verification dates.