Critically discuss whether, and if so how, this statement applies to letters of credit, supporting your answer with English case law and the UCP 600

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As Lord Sumner stated in Equitable Trust Company of New York v Dawson Partners Ltd (1927) 27 Ll L Rep 49, at page 52:

“There is no room for documents which are almost the same, or which will do just as well”.

Critically discuss whether, and if so how, this statement applies to letters of credit, supporting your answer with English case law and the UCP 600