They're not the same. Everett Ross and Thadius Ross have separate identities and storylines in the comics. Their powers, if any, and character arcs are completely different.
The Betsy Ross story is based on historical accounts and tradition. However, historians continue to debate and research certain elements, so we can't be completely certain of its absolute truth.
Rick Ross is a well - known rapper. His real story involves his rise in the rap industry. He started from humble beginnings and through his unique flow and style, he made a name for himself. He has released many hit albums and mixtapes over the years, collaborating with other big names in the music business.