The UI in this forum is not exactly perfect for images, and when they don't have proper names, it's a bit hard to navigate them. But I think it's better if you can share a small project with a short sample file. If that's not possible, at least a project file with no media, but both the sequence you're exporting from, and the one you're adding the re-imported clip to, would be nice. I don't yet fully understand how you're using that exported file in your new sequence - and what sequence settings that sequence has. If the channels are routed differently (say, panned to the middle instead of to the left and right,) you're mixing the tracks, and that will result in different levels.
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