Anything can be compared to anything - apples can be compared to oranges. But that doesn't mean they're the same. SLS nylon 12 parts printed by the Fuse1 are rated at up to 52MPa for tensile strength, according to the Formlabs site: https://formlabs.com/3d-printers/fuse-1-tech-specs/ which is about as strong as Nylon 12 gets. But other forms of nylon, while not 3D printable, are a lot stronger, like extruded nylon 101, which goes up to 82.7 MPa : https://www.lairdplastics.com/produc...3350-nylon-101

If you're making pressure vessels, and the configuration of them requires 3D printing, then the nylon 12 might be as good as you can expect. But if they're machinable, you might want to go with a stronger form of nylon and a CNC machining process.