On the Oboyan Hills map, the instructions to overlay the map such that hexes 2514 and 2515 overlap the main map at hexes 0101 and 0102 are incorrect. These hexes actually overlap the map map at hexes 0118 and 0119, as they did in the original edition.
Per Paul Rohrbaugh on ConsimWorld:
"Hexes 2501 to 2515 on Oboyan correspond to 0105 to 0119 on Prokhorovkha. Hex 0501 on Rzhavets corresponds to 0321 on Prokhorovkha."