Hi there @migperri
Welcome to the Unreal Forum! I saw another post from you on this. I’m not sure which you’re active on. Try to keep a single thread where possible. 
I’d start with post-processing effects. Stuff such as exposure settings, bloom, or tone mapping might differ between the viewport and the render. Check your Post Process Volume settings. Also, make sure that your cam settings (in Sequencer or in the camera actor) are the same for both the viewport and the render.