mGBA to VBA saves (NEED HELP)

So I am trying to take my saves from Pokemon Ruby and Leaf Green from the mGBA emulator and put them on VBA emulator since, to my knowledge, you cannot trade on mGBA. The only problem is I cannot figure out how to load my saves from mGBA in VBA. The file type for saves in mGBA is .sav and .ss1, .ss2, .ss3, ect. whereas saves for the VBA version I am using is .sg1

Does anyone know how I can transfer my saves.... And just renaming them to .sg1 does not work.