your floor looks much lighter. Like they used special walnut or provincial. That doesn't look like any dark walnut I've seen
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You can't really compare a really light color like that to a really dark color like dark walnut. Those floors look natural to me (no stain). Red oak will not always look uniform after staining especially newer stuff. Really old wood looks a little bit different and it is usually more uniform compared to what we can get today. If you have a reputable floor guy I wouldn't be overly concerned if I was the OP