I would consider the replica series to be both similar in superficial appearance and design to the originals but not exact clones. In other words, the replica designs seem to be as close to the originals as a production line build can muster but have obvious compromises to meet the price point. Pepe makes a big deal about use of the same reverse fan brace, Spanish foot, etc. However, unlike production line builds, each luthier made instrument is tweaked by the builder for optimal sound. He might make slight changes to the soundboard and bracing to compensate for the characteristics of a particular piece of wood. Also, the custom instruments normally have a French polish rather than the plastic based finishes used for the replica. French polish is the ultimate in acoustic tone but isn't very durable. All of mine turned to goo on the neck and other areas where I touch. The Polyester finishes, while not as open sounding or loud, can take sweat and splashes of beer without flinching. The replicas have an inlaid graphic on the head stock whereas the custom line sports a plain unadorned head stock. Finally, most of the replicas have position dots whereas the originals have clean fingerboards (my preference).