Here's the inside of the 14x14 floor tom, the length between each screw is 1 3/4 inches.
1-3/4" is the official center-to-center for tom lugs. I bet those bass drum lugs are also 2-5/16"!
Your kit looks cool with the YESS mounting system! I have a few non-Yamaha kits with the YESS mounts.