On one of the Stairway mixes this particular vocalist had to re-do a section of the vocal and what I was provided from her sounds environmentally and tonally very different from the original vocal. The good news is that this is in the heavily effects laden final vocal part so I can mask some of the difference but it's still noticeable. I thought it would be a simple task to essentially match it using EQ but I'm having difficulty. Is there a specific strategy or technique for this? Is there a common technique or goto technique for this?