The separation of the squares 4/a4 and h5/5 in the switches applies to all game pieces, including pawns.
Maybe I can clarify again from my point of view, especially for the knight:
A choice between the squares 4/a4 and h5/5 only goes in one direction. If a piece starts from a1/a2/a3 or from d1, c2 and so on, then there is a choice between squares 4 and a4, whereby the positioning must be clearly on 4 or a4. This means that the choice in a switch is only possible from 'below'. A rook/queen on the rank 4 can only occupy square a4 and not square 4. This applies to the switch h5/5 vice versa.
To clarify with the knight: A knight on 5 can move as shown in figure 10. Knights on g7 or f6 can occupy 5 or h5 because they come from 'below'. A knight on e4 can only reach h5 and not 5. A knight on g3 can only reach 5 but not h5. And a knight on f4 can move to 5 but not to h5.
This means that the squares of a switch are always seen separately and not partially as a same space.
It might be a bit difficult, but I hope it's consistent.
The separation of the squares 4/a4 and h5/5 in the switches applies to all game pieces, including pawns.
Maybe I can clarify again from my point of view, especially for the knight:
A choice between the squares 4/a4 and h5/5 only goes in one direction. If a piece starts from a1/a2/a3 or from d1, c2 and so on, then there is a choice between squares 4 and a4, whereby the positioning must be clearly on 4 or a4. This means that the choice in a switch is only possible from 'below'. A rook/queen on the rank 4 can only occupy square a4 and not square 4. This applies to the switch h5/5 vice versa.
To clarify with the knight: A knight on 5 can move as shown in figure 10. Knights on g7 or f6 can occupy 5 or h5 because they come from 'below'. A knight on e4 can only reach h5 and not 5. A knight on g3 can only reach 5 but not h5. And a knight on f4 can move to 5 but not to h5.
This means that the squares of a switch are always seen separately and not partially as a same space.
It might be a bit difficult, but I hope it's consistent.