Extracting resources from Heroes 3.

Since we're already on this topic, is it possible to extract units from the game in a way that provides .png images of equal size with an animated unit, so that if they are combined into a .gif, it would result in smooth animation (walking, combat, etc.)?

I found this: https://www.spriters-resource.com/download/42167/
but it's not quite what I need. Firstly, everything is glued together into one png, and secondly, I checked and it's impossible to determine the coefficients (equal values) for dividing this image into parts. Consequently, I have to manually calculate the vertex and size for each such RIP, which I don't want to do. I suspect that the resources should contain images that are already divided, possibly with equal size and centering (hopefully).