Two of the axanthic lines have shown the ability to be cross compatible and I think but am not sure that it is the TSK and Joliff lines. A fourth line of Axanthic exists and it is the Nerd line. Generally speaking from what I have read and seen the VPI line is classified as the best looking of them all with Nerd and TKS in a close run for second and third. The Joliff line seems to fade the fastest and the most. Best to make sure you get two axanthics from the same line to be safe.