Please confirm the new hires qualifications

Most of the new hires academics are Diolomas. Though, they do have a spm academics mixed in making more or less the same as their batch. Prior working experience is barely a year, and this is their 2nd job. Question is, what do i lack that gets them higher pays if we have mostly similars exp and qualifications ?

Dont think I can just go to the boss and tell them i found out the new hires pay and asks for a raise too lmao

For context on how I know, most if the new hires are first or 2nd job worker so they dont keep too much confidentiality to their payslip. One of them even showed me their payslip to ask about the allowances and such.

Not being a douchebag, so i did told them to keep their pay more secretive. But yeah thats how i find out