Question RE Ingram vs Createspace

I currently have my book only on Ingram, but I wondered if anyone has used both at the same time for POD? The reason I ask is that Amazon is giving buyers no discount at all on my book even though they get a 55% discount themselves, so I wondered if Amazon gives a better discount to books sold via Createspace since they own it? I didn't necessarily want to use Createspace, but if it will lower the cost of my book for buyers, I may have no choice.