Is my audio interface affecting my end mix?

When I was producing with my Lexicon Omega audio interface, the end results of my mix were loud, crisp and clear, and ever since I purchased an apollo twin, my tracks have been lacking a good sound and are no where near as loud as before. I don't think I'm doing anything differently, but my question is, can an audio interface have anything to do with the end mix not sounding good? I'm really confused and don't know what to do after spending 900 dollars on this interface
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In 2022, audio interface sound quality is all pretty good. Mixing on two different interfaces should not produce two very different sounding mixes. Not to the extent you're claiming anyway.

In terms of loudness, the only thing I can think is that the reference level of the monitor outs are different. It looks like the twin is selectable between +14 and +22. If it's set at +14 then change it to +22 and see if that makes a difference.