No, they're not. You can contact Payson from Payson fanned strings for steel, nickel and ground wounds with a "standard" gauge 45-105. ffstrings @ yahoo dot com

Is the idea that the Dingwall gauges are best for these instruments for some particular reason?

I use both the voodoo's and the payson's, but I find the payson's better for my band, because we tune half-step down and the added tension helps. I guess it's just preference. Take a look at other posts in the string section, though. It'll be helpful

As it happens, I'd like a slighlty lighter gauge. Something equivalent to a .040 on the G. I play with a light touch.