I wasn't aware there was a difference.
Why do you see a difference?
The ancient "three heavens" model of what is up there is still mostly the model we have today, though we think about it differently. The first heaven is the sky - the troposphere, where birds fly, leaves fall, clouds move, aerospace vehicles experience drag, and weather occurs. In the NT, there is some distinction of it by calling it
aire (like our word
air). The second heaven is where the stars (
kowkob in Hebrew) are, and what we call outer space. A "star" in ancient reckoning is any point of light in the sky, though we distinguish between planets suns, moons, nebulae, comets and meteors. All are "stars" in both Hebrew and Greek (
astra). In Hebrew, the second heaven is also called
shamayim - the heavens. So
shamayim can be either sky or outer space. Genesis 1:1 can read that the
elohim created the "sky and land" (
shamayim and
eretz).
The apostle Paul refers to the third heaven, "where God lives". This is not known to us and is not part of the modern cosmological model. We do not know the scope of reality in which to consider this third heaven. Some think of it as
eternity: beyond space-time. This is a completely abstract idea to us because we cannot envision anything outside of space-time. We can employ abstractions involving infinity yet cannot comprehend it in any direct sense. The many
infinity-words that appear in Bible translations (usually as superlatives) simply are not there in the Hebrew language or worldview. Take a familiar example: Psalm 23. It ends in typical translations with "... and I shall live in the house of the Lord forever."
Forever is an infinity-word, but the transliteration of the Hebrew is "for all the days". It doesn't say
which days or how many of them.
Another example that low-level Bible-bashers are fond of involve the translated superlative
all; all the cows in Egypt die in one plague, only to get boils in the next plague. Our English word
all has a Greek logical meaning of "without exception". The Hebrew meaning is more statistical to mean "the preponderance of". The third heaven is where God lives and that can be anywhere from a nearby star to a different sector of the galaxy to another galaxy to ... somewhere beyond. We simply do not know.