https://mega.nz/#!JYMEFA5Y!pll1ILT7oHTv5uJCSddoa4Yl0R3P2GWRRzWtkdlYhVQ
this is the link to the .ips and .xdelta files (whichever you prefer), needs to be applied to the ROM
Super Mario Advance 4 - Super Mario Bros. 3 (Europe) (En,Fr,De,Es,It) (Rev 1)
CRC-32: 8d84acfc
MD4: 32ae0e4fbd649bf1cf118507b4eea77c
MD5: ae8af6b539d509019bdd06565c10804a
SHA-1: 2e5ce11a893464dc0cce0a6b451580ba35a7e5de
EDIT: I do hope I did not underdump the ROM. I assumed the ROM would still be 8Mb in size. I gave the game a quick test on VBA and the normal game and additional levels worked just fine.
My guess is the EU ROM had enough space left without having to be increased to 16Mb (the US release was increased from 4Mb to 8Mb for the VC release to hold the additional levels.
EDIT: here are the hashes for the patched ROM/VC Release:
CRC-32: d4f45b01
MD4: 10406a1dc607ad06858419ab1033a5e8
MD5: 733e976fd06d65e9f5635b836a14a81b
SHA-1: 00667ce3da4bfee3182c4445ac2f5483870be97c