I don't have any pictures to show, but from what I know, none of the 4 lines are compatible. There's The Barkers Line, NERD's line, the Sutherlands line, and the Jolliff line.
Joliff and The Snake Keeper line (The Sutherlands) tends to brown out more than the VPI line as they age. TSK line do look wicked as babies though. Im not sure one bit on the NERD line.