Will the engine out of a Ford Festiva fit Aspire?

No, the engine from a Ford Festiva will not fit a Ford Aspire. While both are small cars, they used different engines. The Festiva typically had smaller, often 1.3L or 1.5L engines, while the Aspire used slightly larger engines, generally 1.6L or a different engine architecture entirely. Even if the displacement were similar, the mounting points and other components wouldn't be compatible.