Since oral records are subject to differ somewhat each time a story is told, they are not considered to be as reliable as written sources (In this sentence, is “differ” a noun?) 用 英語 (美國) 要怎麼說？

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common meanings of be subject to something

- A is required for B to happen or regulates the manner in which B can happen.
- A is a process that often happens to B.
- A is thing that may act on or become associated with B.


in your question, be subject to is dependent to "differ" or become associated with "differ" or in conditional upon "differ" where subject to acts as an adjective and differ acting as a verb
makes sense?
ex. Your promotion is subject to review.

*late reply, drinking whiskey to sleep, we're on the same time