They're not, Avalon released datasheet for them a while ago. And they are using different clock frequency and different voltages.
There's still a lot of components to rescue though perhaps? New PCB, a few resistors to set the voltage and a different oscillator?
From glancing at it, it looked like the comms protocol was similar but I might be wrong.
The real problem is that the rapid growth in the network makes anything like this too risky. It will be interesting to see what happens to this auction.
Yes it seems to be identical (at least timing is and anything else can be changed in firmware).
So basically only Avalon footprint (pinout) has to be changed (so small modifications to the board around ASICs), then you will have to replace the oscillator for 25MHz one and power regs for PLL (because 55nm Avalon now uses 1.0 instead of 1.2V).
Core voltage is now 0.9V, but since IR3895 can go as low as 0.5V output, no problem with that (you will only change one/two resistors as you're saying).
I'm planning to modify the project, but I'm probably not going to build one (maybe just one board if I'll be able to get a few chips from somewhere - and it wont be an auction).