The Slingbox Pro and the Slingbox AV have different power requirements. As, I understand the Slingbox Pro is unique that it is only compatible to itself. Where as the Slingbox AV's power supplies is also compatible with the Tuner and the Classic.
You can verify that by looking at the bottom of each Slingbox, there is a label which indicates the power requirements; volts, amps, and polarity. There is also a label on each power supply which indicates the power that it provides.
The IR Blaster cable should all be the same for all of the Slingbox models.