Save margin guides by percentage as preset

Hello,

Very often I have multiple images by the same ratio but different size. I want to add to every image the same margin guides. The solution is to use the percentage (%) instead of px, cm, mm, ect.

So, I do this option by (%). for example Top 7,5%, Left 7,5% Bottom 7,5%, Right 7,5% and save it as preset.

But if I load the preset to new image the preset comes by PIXELS of the previous saved which is not correct for the every new image.

Any help please....