We just got Kamikaze a week and a half ago. Kaze is high energy and Ryoko is laid back. Other than a lot of sniffing and a little bit of play that looks like RYoko is playing, but a the time saying "Mom what is this other dog doing, i dunwanna play".
They have not gotten in any major tifs. Since Kaze is new he doesn't eat his food as fast as Ryoko so Ryo tries to steal his food all the time.
They are the same age so there is no difference there. Kaze's hair is much much thicker than Ryo's. I wasn't prepared for that, but at least they both have the same silky texture. I would say be prepared to have two with different types of hair, I had never thought of that.
Also remember its double the money spent.
And Walks are not easy so far, we are a mess when walking so instead of the coupler I will have to get a second leash until Kaze learns to heel.