It should just be a matter of having the same name as the ROM (albeit with .sav on the end instead) and putting them in the saver folder. The EZ4 does not have any special header/footer or size requirements.
If not then try loading them in VBA (file -> import -> battery save) and then exporting (choose export instead of import) them before renaming and going on as normal.
Depending upon how it is done then pokemon can pose a problem but that might involve making it the right size (whatever it is when you patch a ROM then make your ripped one the same size).