The graphic is from earlier in this thread where the PCB was first posted. It matches the traces on my PCB. Both appear similar and no printed Revision level is found. I bought my boards from another member, so probably the first.
Kevin quickly drew up the GG (a tube version of the Carbon) to humor us vacuum tube Luddites.
Your example looks like a later version. Basically the same, just tidied up a bit. The amazing thing is, even the quickie electrostatic amp designs that Kevin publishes, are simply incredible sounding. He is an irreplaceable source of inspiration for us DIYers.