How to get 1.7.10 mods into 1.6.4?

How to get 1.7.10 mods into 1.6.4? - 1
Added (1). how do I get 1.7.10 mods into 1.6.4 Minecraft Forge
Added (2). Im using forge for 1.6.4 but I need customNPCs for 1.7.10 in it

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