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Of course it's not logical or lethical
Based on the experience/improvement of this person in his position. If they earn the raise/high salary then it's ok. You need to focus more on yourself and not to be involved in other's personal issues including salary which is highly confidential.
مهارات التسويق لبيع منتجات أو منتجات أو بضاعه وسوبرات ملابس
What somebody earned in their previous job is none of your business.
As an aside, the system of paying people based on an increase from their previous job is utterly irrational - it penalises the good people (who do not get the increase they deserve) and rewards the semi-competant (by giving them an increase they do not deserve).