[Graphics] Snow Grass Animation

Hi all,

For my hack (Based on Fire Red US) I want to import a second grass animation with grass on top of a snow tile. I am thinking about replacing the tall grass or tiny grass animation and use that to create this. Does anyone have any experience in doing this or something alike?

Related to this: I only recognize the parts of the grass animation and the tall grass animation, does anyone know what the other parts are related to?

Grass Animation:

in game fr, only grass is used, other parts of this image in other gba games. In fr, the animation of other herbs is turned off, ie through advance map in options, having exposed the tall grass, you will not get it .(translate google)