Flat iron steak comes from the Chuck part of the cow.
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schulterblatt
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A flat iron steak has, per 4 oz:
260 cal
19g fat
19g protein
A flank steak has, per 4 oz:
174 cal
8.4g fat
23g protein
A flank steak has less calories.
It also has less fat, and more protein.
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No it is not the same. When a beef is butchered it is hung on a
rail in two pieces or halves. Then each half is cut in half so the
carcass is in quarters now. You have a forequarter and a
hindquarter. The flank steak comes from the hindquarter and the
flat iron steak comes from the forequarter.