I guess no, there are some emails between Steam and some users saying parts from the SD-OLED are not compatible with the SD-LCD. Since the Oled screen is thinner it made more place for a bigger battery. I would say the bigger battery would not fit into the old deck. But for a hundred percent answer we’ll have to wait for some tests regarding this.

Unfortunately no. Dave2D addressed this in his video.

Nope, it’s thicker and won’t fit