I'm sorry, but I'm not following.

Dave's Single and a Quarter Pounder are sold as different products, but they're both still quarter pound hamburgers.
Are the coco fiber & coconut husk so different that you couldn't use twice as much of either in lieu of the other?
Part of why I'm asking is that we're going through a similar exercise in mixing up substrate for a tortoise, and using coir for any coconut fiber products. It's not making any difference.