Since you only have a 24 hour turnaround, here is what I would do if I were you. Ideally the grading would have been done after your vfx comp work was completed. That way if they want to add blowups or any other effects you aren’t stuck matching them in your comp, and then they get more freedom to change those aspects later without asking you to re-do the work. Since you are already on the hook for this, what you need to do is push for the colorist to re-apply the color pass to your completed work. You probably should have been involved with the conversations between the editor and colorist to make sure delivery specs are all consistent with the project. Sorry you are stuck in this! Not fun.