Did you mean you are on the
left side (where the tar mother was) and the roach is on the
right (where the snake was)? If it was the other way, you wouldn't need to switch places...
It's not hard to switch places, knowing that if a roach's movement is blocked diagonally it prefers to move vertically over horizontally.
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×So, starting from the tar mother's chamber with the roach in the snake's chamber, point your sword east, and move north. Go around the west side of the L-shaped obstacle, with the roach following close.
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×When you are on the X, step NE and then SE. Now you will be on the right and the roach will be on the left.