We don't recommend using any bat you intend to use in a game, like the 2018 Louisville Slugger Select 718 -5 USA Baseball Bat: WTLUBS718B5, in cages throwing rubber dimple balls. These type of balls are more dense than regular baseballs, therefore making them more damaging to bats.
The new USA standard was designed to try and bring bats more to the performance of a wood bat, just like BBCOR was intended to do. The pop should be very similar between the two certifications, yes. A -5 bat would provide a little better bat speed due to the lighter weight, but obviously you have less weight at the point of contact. You may see better power if the added bat speed can overcome the loss in weight.
The 2018 Louisville Slugger Select 718 -5 USA Baseball Bat: WTLUBS718B5 is approved for leagues like AABC, Babe Ruth, Cal Ripken, Dixie Youth, Little League, & Pony. This bat will feature a BPF similar to the BBCOR BPF of .50. I would consider swinging the 2018 Louisville Slugger Omaha 518 -5 Senior League Baseball Bat: WTLSLO518B5 for travel ball since the BPF on this bat will be much higher resulting in a hotter bat. To summarize; USA Bats are for League Play, Senior League Bats are for Travel Play, and BBCOR Bats are for High School and Collegiate Play.