Sideshow did produce more Jabba's than the throne. The regular Jabba was 4000, then there was also the "inclusive edition", the exclusive version that came with an extra "Ornate Toasting Cup" (which I own) . I'm sure there were more than only 200 of the Inclusive Edition with the cup, so there are more Jabba's than the 4200 thrones.
Here's the listing for the inclusive, as you can see no production number like the regular.
https://www.sideshowtoy.com/collectibles/product-archive/?sku=21461 (take off the one at the end to see the regular edition of 4000)
Also just as an FYI, if you ever want to know if there is a SS Ex of something simply add a 1 to the end of the product number/sku, and for the opposite subtract the 1 at the end.
They never gave their Inclusive Editions a number. They were basically the Exclusive version. Never quite understood why they called it Inclusive rather than an Exclusive. The only three I can recall were Jabba & Darth Maul & Sith probe droids (they came with a sand topper for the base, Maul came with broken saber just like the newer Exclusive).