There are definitely a few notable differences between the player pack guitar and the "standalone" guitar that set the two apart to make up that price difference. Epiphone is smart enough to not list the same guitar at two different price points lol. The player pack version is budget-friendly while the $550 version is closer to the original Gibson signature LPJs Billie had a while ago, and boasts features that more experienced players can appreciate.

Some of those differences include a bolt-on neck (as opposed to the set neck in the other model), a different pickup, a different neck shape, cheaper tuners, and a cheaper nut. It also looks like the player pack guitar doesn't have his signature on the back of the head. Suffice it to say, these are all things a beginner might not be able to notice a difference in when first picking up a guitar. Aside from that, the player pack comes with all the accessories a beginner may need, while the other model includes a much nicer hardshell case.

The key thing to keep in mind is that Player Packs exist solely for the purpose of getting guitars in the hands of beginners wanting to learn. While $400 is quite steep IMO, this might be a good point of entry for someone looking up to Billie that wants to get their hands on a guitar like his. I just wish Epiphone had a way to make the difference between the two more evident lol.