It’s impossible to make images of different size (proportionately) look the same size in a grid.
You could make each cell of the grid have a background behind each image and have those backgrounds be of equal height on a row by row basis, or indeed make every cell in the grid posses a faux equal height.
However…!
Gid does not possess the ability to force a cell to be the same height as it’s neighbour, for a couple of reasons.
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No Javascript. This could be done with javascript, but we have opted to keep this grid javascript free.
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This could be done with CSS using table-cells. The reason we don’t do that is browser support. Older but still widely used browsers do not support table-cell.