Generally, they would not, no. That being said, you could use Ancient Wuxia with standard fantasy rules or use the ones in Foundations.
Also, I would have no issue if someone house-ruled that the could stack.
â€œI despise stallions. I ride them as I ride an ugly noble women--smiles for appearances and politics only. Stallions. All personality with no depth. They prance like ponies and trot with arrogance. I always say, respect your mules most of all. A stallion may lead with the king and gather the eyes, but a mule will follow behindâ€¦and carry your kingdom.â€