Sadly not. They are both based on the engine but they are slightly different versions. When working on the game the developers make slight changes to the engine in order to make certain features work. It's all officially called the SGE engine and there's no version number but the SAGE engine that runs CnC is different from the BFME one. In the same way that the engine that run BFME1, BFME2 and ROTWK are all different versions. There's no one SAGE engine, just bundles of whatever code were needed at the time to make the game they were designing work.