Here is the print sheet pattern for 1954 Bowman. As can be seen, Larsen was in row 1, Col 5 of sheet 4 while Seminick was in row 2, col 4 of sheet 6.
I don't know how many rows were printed on a full Bowman sheet, but the column flip (4 to 5 or vice versa) certainly supports an authentic wrong back.
1954BowmanPerfectSheet.jpg