I did some Googling and the images I found for both models looked Japanese...then I found this at WIkipedia:
The Epiphone Rivoli was a semi-hollowbody electric bass guitar designed by Gibson and built by Epiphone in Kalamazoo, Michigan from 1959 until 1970. From 1993 until 1999, the model was reissued as a part of the Korean-Japanese Epiphone line.
After Gibson acquired Epiphone in 1957, Gibson installed an Epiphone production line for archtop instruments in its own factory in Kalamazoo, Michigan, using the stock that Gibson acquired in the takeover, with some models taken directly from Gibson (e.g., the Casino and Riviera), other models specifically designed for Epiphone (Newport, Crestwood) or already produced by Epiphone (Emperor, Sheraton,...). In 1959, the Epiphone Rivoli debuted as a sibling to the then one-year-old Gibson EB-2.[1]
Made on the same production line as the EB-2, the Rivoli closely followed the production of the Gibson model; they shared the same body, neck and hardware. Only certain aesthetic aspects differed, such as the headstock and a tortoise-shell plastic pick guard on some examples instead of the black plastic used on the EB-2.
The Rivoli featured an ES-335-style semi-hollow body, made from laminated maple, a short 30.5-inch scale mahogany neck and one large "Sidewinder" humbucking pickup in the neck position. The electronics consisted of a single volume and tone knob, and a "choke-switch" (from 1959 onwards), which enhanced or cut the bass frequencies.
When Gibson decided to move Epiphone production to Japan (Matsumoku) in 1970, production ended for the Rivoli. Its successor, the Epiphone 5120/EA-260, shared very few similarities to the original Rivoli, and had a bolt-on, full-scale maple neck, other hardware and a redesigned body.
https://en.wikipedia.org/wiki/Epiphone_RivoliThat seems to explain it - two different series with similar names, but very different in design, production location and electronics.