From the two positions, the common face is 3. Moving from 3 in a clockwise direction, the faces are 4 and 1 in the first die, and 2 and 6 in the second. This means 4 is opposite 2, and 1 is opposite 6. The remaining pair, 3 and 5, must be opposite each other. So, if 5 is on top, 3 is at the bottom.