In theory, they should be similar - made to the same specs, just the SE's are made overseas, and the Core one's are made in the USA. I would assume the materials used are sourced separately too. Do those 2 factors make them sound different?...
To be clear, the current versions should be the most similar - they're all referred to now as "LT" (low-turn), whereas up until recently the USA one's were LT but the overseas ones were not designated as that.
There are a lot of people who strongly feel the imports are inferior, and there are also plenty who are quite happy with them. Best advice I can give is to play and compare them yourself, and decide what sounds best to *you*