According to Wikipedia, lexical stress in Standard English* is "phonemic" (whatever they think they mean by that), using the minimal pair insight/incite as an example. My hypothesis is that, across Standard English, lexical stress is mostly consistent. I am however not very familiar with the many different English accents, so I wonder whether this is true.
Note that I'm specifically not considering prosodic stress, or how stress is realised (inflection, vowel length, etc.) in different accents. I'm only asking about one part of the puzzle: if Standard English speakers are asked to mark the stress of words, would they mostly agree**, regardless of their accent?
* I know, this is a vague term. I'm mostly concerned about what's called "native English" in North America, the British Isles, Australia, and New Zealand. If you believe that's too narrow of a definition, please don't hesitate to comment on that.
** If you need a metric for agreement: the correlation of the placement of primary lexical stress for each word (only distinguished by exact spelling and part of speech, to account for details like heteronyms and unexpected spellings), weighed according to that word's frequency (in a corpus of your choice, which usually also comes with a preferred PoS inventory).