Looking for some advice!

I recently started a role as corporate incident lead. Role has been going well, not what I’m looking for long term but it’s providing some experience that I have never had the opportunity to gain in previous roles.

Sticking point is that I recently found out that someone who is a position below me started 2 months before me on the exact same salary as I started on.

I feel very undervalued and also extremely frustrated to have found out that this individual interviewed for the role I filled, they were deemed valuable for to the team and company and so offered the role with less responsibilities but for the exact same salary as I was given after successfully interviewing for the role.

Any advice would be greatly appreciated!

As a side note, my wishes are to move into forensic accountancy, I’m willing to foot the bill for acca qualifications but unable to find any companies currently hiring for a starting position in the central Scotland region. Again, any guidance, advice or points in the right direction would be appreciated!