I suppose you might call these "twins separated at birth".
Although both are by different architects, they were commissioned and built by U.S. Steel around the same time (1970 for the Pittsburgh tower, 1973 for New York). They both share a similar exterior corten steel structure as well.
The U.S. Steel Tower in Pittsburgh takes precedence with a height of 841ft (256m) and 2.3 million square feet (214,000 square meters) of floor space.
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ittsburgh-pennsylvania-usx-tower.jpg)
1 Liberty Plaza has a height of 743ft (226m) and 2.2 million square feet (204,000 square meters) of floor space.
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