I don't think there is / was a GS-14, at least that has been discovered.
I remember back when I was trying to complete my set of Gowin games, and then over the summer I guess, I had finally "completed" it. Then a contact from elsewhere in Asia had contacted me and asked if I had wanted to purchase GS-01, and it was the first time I ever heard anything about it, thus picking it up. In the western world, I think GS-01 is totally unknown until now.
So maybe there is a GS-14, but if there is, it must be very rare, as I have never seen it before, also not on the old website.