There is a theory, Of course not a popular one, based on the scripture that the second verse of Genesis clearly states that earth was already here (But in a ruined state)
In the beginning
The great disruption chronicled in Genesis 1: 2
In the beginning God first created the heaven and the earth.
And the earth was without form, and void; That's how verse two is usually translated.
It's interesting though if you look at the word "was" is hayah
which can mean to become.
1961. hayah ►
hayah: to fall out, come to pass, become, be
Original Word: הָיָה
Definition: to fall out, come to pass, become,
So the earth became void and chaotic...
We see that in Isaiah it was originally not created a waste.
It was not created so According to Isaiah 45:18
For thus says the LORD who created the heavens, the God who formed the earth and made it, who established it and did not create it a waste, who formed it to be inhabited:
2 Peter3:5 Talks about they being ignorant about the heavens of old and the earth standing out of the water and in the water: Whereby The world that was then was, being overflowed with water perished.
For this they willingly are ignorant of, that by the word of God the heavens were of old, and the earth standing out of the water and in the water: 2 Peter 3:5
There are those who say
this passage is not a reference to Noah's flood.
Compare the heavens and earth which are now to the phrase the heavens were of old. They heavens of Noah's day were the same heavens As an Adams day. Noah's flood had no effect on the upper heavens.
So in regards to your question
"Is it the same earth?"
I would venture to say yes, and it is possible that it has been through destruction, and restoration. Of course we know there is a new heaven and new earth coming again.
Genesis is always such a fascinating study with a lot of very different interpretations.
This one can be compelling with much more information that is out there in books on this subject.