is it posible to copy a filter from one layer to another?

[Ofnuts]

You don't "copy a filter"? Either you copy a layer, or you run the filter again, with the same arguments, on the other layer. If your problem is to use IWarp interactively on one filter, and have a script to replay it automatically on some other layer, then it's a whole other problem, AFAIK there is no way to retrieve the arguments of a filter that has been used interactively. And IWarp makes this even harder, since there is no useful way to call it non-interactively.