The following diagram is for the "Orange Pi 2 (mini)". I don't know at this stage whether this diagram applies to other Orange Pi units or not.
The following diagram is for the Raspberry Pi. Note that older Raspi's used a 26 pin connector. All I can say comparing this to the Orange Pi pinout is that they seem to put power and ground in the same locations. Any expectations beyond this would seem ill-founded.
Tom's electronics pages / firstname.lastname@example.org