compare EP3C80F780C8N and EP3C5E144C8N

Hi all,

I am a beginner of using Altera. Currently, I am doing a project which optimizes the cost of a device by replacing EP3C80F780C8N with EP3C5E144C8N, while still using the old vhdl code. They are both Cyclone III device, but the number of pins are different. Do I need to modify any pin mapping? If yes, please show me how to do it.:)

Thank you greatly for helping this amateur,

Best Regards,