There is a hell of a difference between CA and MBA (finance). CAs mainly end up doing accounting/MIS/reporting kind of roles after they complete their course whereas MBA(finance) folks typically end up in Investment Banking, Investment Management (fund management, asset management etc) Corporate Finance type of roles. The latter has very little to do with accntg per se. In fact IM has zero component of acctg. I am an engineer and post ISB, i am in a Investment Banking kind of role. Before my MBA, i didnt know the "a" of accounting. Of course, there could also be some corp fin roles which could involve some amount of accounting knowledge like the FMP program that GE runs.
So, the value that an MBA(fin) can add to your CV depends on your interests and your past work profile. If u have any more doubts, feel free.