The url is imx6qp's homepage. It says:The i.MX 6QuadPlus family delivers dramatic graphics and memory performance enhancements and are pin-compatible with a broad range of i.MX 6 processors.
whether can i understand that imx6q and imx6qp is pin-to-pin compatible?
I think you are right. For the 6DQP improvement, you can refer to this FTF presentation.