The VBOB is DW's top-of-the-line, flagship model... so it gets alittle extra hand-fitting and internal-polishing/attention.
Years ago, the CBOB had the 'cosmetic' differences you mentioned (trigger, sights, grips, two-tone finish)... but didn't get quite the 'detailed attention' as the Valor. Now they are the same... same size, same parts, same attention, same quality... just different cosmetics!
DW has decided not to go thru the certification process in CA for their Valor, and markets the CBOB in CA exclusively... basically same gun!
My CBOB is one of my favorite 'commander-size' 1911s... dead-accurate and flawless... just like my full-size Valor.