They're the same company.I got mine from Sophia Corp but I also looked at tops. I feel like I ended up ordering from Tops though. It was kind of weird.
Same general architecture, based on PS1, but they're not swappable. I think every brand had their own security chip and bios, so the Capcom ZN-2 stuff only plays on a Capcom ZN-2 board. So similarly Taito G-Net needs a Taito G-Net base. Here's Guru's research on it: http://members.iinet.net.au/~lantra9jp1_nbn/gurudumps/ZNx/index.htmlIf I have it straight, the G-Net motherboard is the same as a ZN-2, correct? I've been searching for a ZN-2 mobo for a while, don't mind paying a little extra just to be done searching.
If I can ask, how much was the total cost including shipping?