1. Key Difference 1: Syntax - The syntax of JSON (JavaScript Object Notation) and Rust differ significantly. JSON uses a simple and human-readable syntax that is based on JavaScript object notation, while Rust uses a syntax that is inspired by C++. Rust's syntax is more complex and incorporates features like strong typing and memory safety.

2. Key Difference 2: Data Types - JSON deals with data in a generic and dynamic manner, supporting basic data types like strings, numbers, booleans, arrays, and objects. On the other hand, Rust has a static typing system that requires explicit type declarations. Rust supports a wider range of data types, including primitive types, tuples, arrays, slices, and custom-defined structs.

3. Key Difference 3: Memory Management - JSON does not have any built-in memory management mechanisms. It is primarily used for data interchange and does not provide direct control over memory allocation or deallocation. In contrast, Rust has a unique memory management model that uses ownership, borrowing, and lifetimes to ensure memory safety, prevent data races, and manage resources effectively.

4. Key Difference 4: Error Handling - JSON does not have a standardized error handling mechanism. It often relies on conventions or external libraries for reporting and handling errors. Rust, on the other hand, has a built-in error handling system that uses the Result and Option types to handle both expected and unexpected errors. This ensures safer code execution with explicit handling of potential failures.

5. Key Difference 5: Concurrency - JSON is not designed to handle concurrency natively. It is primarily used as a data format that can be shared between systems. Rust, on the other hand, has built-in concurrency features, including lightweight threads called "tasks" and asynchronous programming support. Rust's concurrency model allows developers to write highly scalable and efficient concurrent programs.

6. Key Difference 6: Compilation - JSON is not a programming language and does not require compilation. It is usually parsed and processed by other programming languages. Rust, on the other hand, is a compiled language that offers low-level control over system resources. It is compiled to native machine code, resulting in high performance and efficient execution.

In Summary, JSON and Rust differ in their syntax, data types, memory management, error handling, concurrency support, and compilation process. JSON is a lightweight data interchange format, while Rust is a powerful systems programming language with advanced features for memory safety, concurrency, and performance.