The Prep Bible.
These two units fit different platforms. Read this as a line-vs-line breakdown, then pick the version cut for your own setup.
Warne Maxima HRZ 515LM is a 30mm high ring set built from steel, with quick detach mounting for Weaver or Picatinny rail. Ring height is listed as High.
Warne Mountain Tech 7240M is a 35mm low ring set made from 7075 aluminum, mounting to Weaver or Picatinny rail. Ring height is listed as Low, and it is specified for rifle use.
These two are built for different scope tube diameters, 30mm for the Maxima HRZ and 35mm for the Mountain Tech, so they are not interchangeable for the same scope. They also differ in material, steel versus 7075 aluminum, ring height, high versus low, and the Maxima HRZ adds quick detach mounting while the Mountain Tech listing does not mention that feature. Price also differs, 99.99 for the Maxima HRZ and 159.99 for the Mountain Tech.