Won Hyo
When people notice similarities between Chang Hon patterns and older Karate patterns, the example they always point to is Won Hyo. Not only does it contain 80% of Pinan Shodan/Heian Nidan, the movements appear in the same sequences and at the same point in the pattern.
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Won Hyo is Pinan Shodan.
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The following videos were used as reference:
ITF Legacy performance of Won Hyo.
Hirokazu Kanazawa performing Pinan Shodan (Heian Nidan).
The openings of both patterns, repeated on both sides, are identical, save for Won Hyo using a knife hand.
They both proceed with a side kick, Won Hyo to the front, and Pinan Shodan to the rear. They both land facing North in a back stance with a knife hand block, followed by two more knife hands and a spear hand.
Won Hyo (pictured below from the side angle) then repeats the beginning, which Pinan Shodan does not. Returning South, however, both patterns are identical:
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-turn South into a front stance, execute circular block / inner forearm block
-front kick
-punch
-repeat
The above block is often referred to as an "inside block" in modern Shotokan literature. Choi's 1965 describes the block in "HEI-AN PATTERN II" as a "circular block," meaning that Won Hyo is performed the same way that Choi performed Heian Shodan.
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Won Hyo's ending kick and forearm guarding blocks do not appear in Pinan Shodan, although knife hands to both sides
appear when Won Hyo repeated the opening section.