Looks like more than a "copy". Sounds like they are made by the same company or made for traditions by Hornady? Descriptions for them use the exact same words.

For Hornady FPB:

The FPB features Hornady's exclusive Flex Tip Technology. The Flex Tip creates a very streamlined and very durable meplat that maximizes exterior ballistics - a BC of .285 makes the FPB one of the most ballistically efficient full-diameter muzzleloader projectiles on the market (Compare PowerBelt'sŪ .220 for the 348 gr. AT). Upon impact the flexible elastomer tip compresses into the nose of the bullet, causing violent expansion across the widest range of velocities (800 to 2000+ fps) ever. This violent expansion creates a large temporary cavity, resulting in a VERY dynamic transfer of energy for quick kills and minimal tracking.

For Tradtions Fullbore:

Traditions new Full Bore bullets are extremely easy to load and no longer require a plastic sabot. The hard-hitting patented Flex Tip design delivers devastating terminal performance at any range. Upon impact, the flexible elastomor tip compresses into the nose of the bullet, creating a large, temporary cavity resulting in minimal tracking and quick kills. With a ballistic coefficient of .285, it makes this bullet one of the most ballistically efficient full-diameter muzzleloader projectiles available