BMW G Series Key vs F Series Smart Key

What’s the difference between BMW G series key and F series key？ Can we use F series key for G series?

Here is the clue.

Design:

F Series Keys: These keys, used in BMW models from roughly 2008–2017 (e.g., F10 5 Series, F30 3 Series), have a more traditional, bulkier design. They typically feature a plastic housing and a physical blade for emergency access. The design is functional but less sleek compared to newer models.
G Series Keys: Introduced with BMW’s newer models (e.g., G20 3 Series, G30 5 Series, starting around 2017), G Series keys are sleeker, more modern, and often have a premium feel. Some feature a slimmer profile, metal accents, or even touchscreen displays (e.g., BMW Display Key). They may also include a rechargeable battery via USB or induction.

Technology and Features:

F Series Keys: Operate with older security systems like CAS (Car Access System) or early FEM/BDC (Front Electronic Module/Body Domain Controller). They support basic functions like locking/unlocking, trunk release, and Comfort Access (proximity-based unlocking/starting). Frequencies are typically 315 MHz (North America), 433 MHz (Europe/Asia), or 868 MHz.
G Series Keys: Use advanced FEM/BDC systems or newer BDC2 modules, with enhanced encryption for security. They support additional features like remote start, remote parking, or vehicle status display (on Display Keys). Some G Series keys use Ultra-Wideband (UWB) technology for BMW Digital Key compatibility, allowing smartphones to act as keys.

Security Systems:

F Series Keys: Tied to CAS or early FEM/BDC systems, which are less encrypted than newer systems. Programming often requires dealer intervention or specialized locksmith tools.
G Series Keys: Linked to highly encrypted FEM/BDC or BDC2 systems, making DIY programming more challenging. They require advanced tools (e.g., Autel IM608, ABRITES, Xhorse, APPRO2, CGDI A2, Yanhua ACDP) or dealer activation for pairing.