Are there any instructions on the pose of hand during meditation?

As I see and learn there are typically two different positions of palms and hand that I see people meditating in. One is keeping the palms turned up and kept on knees like this picture; which is a classic yoga pose and the other way is to keep the palms in your lap with thumb tips touching each other, like this; the classic zen pose. When I meditate I keep on changing between these two, as I feel comfortable. The two poses yield different mindfulness for me. I think, most of the Buddhist meditate like the second pose, but the first one also yields better meditative awareness. I want to ask are there any instructions in the suttas about this. Is there a Buddhist pose and Non-Buddhist pose?