Yep, oddly enough I found pool elbows at Lowes. No DWV on them, and as you described the pvc was a bit thicker and the sockets were deeper. They weighed more than the DWV sweeps that Lowes had. I was a bit surprised to find them in the next town down the road. I can't shop for plumbing at my local Lowes because the shelves are rearranged by 3 year old snots.
The long sweeps are conduit pvc. My system has never exceeded 14 psi at the filter. Everything else is downhill from there. If my pressure was up at 60 psi or higher

. The old plumbing I dug out was riddled with DWV fittings and pipe and much of it survived 45+ years. I'm betting the conduit is significantly better than the DWV.