Talking [Q] G900I Model Handset Want to Flash G900F Rom

To Every One, i've had a G900I Australia Model S5, I wanna to flash the G900F Original Stock Rom.
I did try, but odin show me fail. nowadays is it need to match the model number and the ROM? like G900I only can flash G900I Rom?
If Not, can everyone told me how to do so?
Thank you very much first.