If you perceive those two as being equally loud than I'd suspect that's an enormously overgassed setup.
11.5-12.5 middy's are pretty sweet suppressed.
Short barrels can get quiet when the gas is under control.
Even 10.5s can sound good with the right gas port-
https://www.youtube.com/watch?v=xzRQJJG9WBsEdit- here's ray metering a 15db diff at se purely due to gas port- size.
https://youtu.be/l870SkASH5Y