Resizing layers with different aspect ratios

Hi,

Here are 2 examples of the problem without the script to make them relatively same sized on the new backround. Im not sure if this helps. If it matters, i use premade paths to cut out the products of the white backround.

One way that you may want to try using actions is to convert layer (I am assuming you have normal layers) to Smart Object then edit SO using Fit Image to resize to certain dimension then to save file and perhaps rasterize or Convert To Layers. There is limitation using actions which perhaps can be solved using Conditional Actions. For example: if you have Background layer it can be set to continue playing action when encouteres Bg layer but to run action to convert and resize layer when normal layer is currently selected. There are probably and more solutions which I can not think of and check right now.