I've been looking for a GO and NO-GO gauge set for .223 Wylde that's in stock. While doing this I stumbled on a few places that said that headspace gauges between .223 Remington, .223 Wylde and 5.56 NATO are universal.

Is there any truth to that? Can I just find a Remington or NATO set and use that on my rifles?

If not, any recommendations on where I can find some Wylde gauges?