The Fetrotech tool silver works with pcmtuner because PCMtuner has a bridge at this point. It works on the same software, the difference is in the bridge.
Here is the main board of both black and silver version and you can see the difference easily.
Fetrotech black board with bridge
Fetrotech silver board without bridge
If you want your silver fetrotech to work alone. Then do a little modification. That is the difference between black and silver. much more comfortable work.
You are at your own risk.