Blanket washing: difference between Nikwax Rug Wash and Tech Wash

Does anyone know the difference between these two products? The Tech Wash is marketed for tents and waterproof clothing and the Rug Wash for horse blankets, but I can’t find if there’s a chemical difference between the two that would change the efficacy.

For my purposes the main difference seems to be that I can walk down to REI and get the one but have to order the other.

They look and smell the same. I have no idea what difference there is between them and suspect it may just be for marketing/sales purposes! I can get the rug wash easily at my local supplies place and use it for rugs and my own waterproof coats, etc!