Table position.

In the 4/5th place table battle with Newcastle.
Assuming we end up with same points and goal difference (current situation)
Does a draw on Sunday favour Chelsea in terms of league position, as we won the reverse fixture 2-1? Head to Head being the next consideration.
Is this a correct assumption?
So why is it that on the current table position , after 35 games played by both teams , with both teams on same Points/ GD.... are Newcastle placed in 4th position and Chelsea 5th?