You will be fine. I am currently running 255/35/18 square which is about as far off from factory sport wheel specs as you can go (because used run flat RE050A's in this size are everywhere and make great street/rainy track day tires and I can get them for around $35 a pop).
I have also run mismatched tires front and back and have never had an issue. In my experience, our cars are not very sensitive to tire size differences.
Be careful what these "forum experts" tell you. Anyone who tells you that running 265/35/19 in the rear and 235/40/19 is going to be a problem does not know what they are talking about.
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The Reed Law Firm; Michael Fasano VA Attorney and Counselor at Law: A Virginia Traffic, Criminal, and Family Lawyer. https://reedlawva.com/
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