Need new song mastered plus continuity on 5-song EP

Good morning, I am a gospel/inspirational artist looking to have a song mastered (it has just been mixed). Additionally, I need to have the other 4 tracks for my EP balanced against the newly mastered song. The other 4 tracks were mastered by a different engineer but I will need to ensure the volume for all songs are appropriate balanced on the project. Note: the new song to be mastered will also be the lead-off track to the EP. Do you have the bandwidth to help? In advance, many thanks -Anita Faye