Not 100% sure but with limited technical knowhow but common sense: 1kg is on 1 kg. Assuming that physical density of water is smaller than Ali or Ferrous the scale should tip to the right as the right side has less water but more metal than the left… Disclaimer: “…” 😂😄

Left... More H2O.

Left. We can ignore the mass of the balls, since they are equal. Due to the smaller volume of the Fe ball, the left container contains more water.

Left

left. the ball on that side has displaced less water, and balls are not part of the weight on the balance