i9300 roms on i9305?

Hi all.
I've done a bit of research and haven't found a solid answer.
I know the modem is completely different on the two devices and the 9305 has an extra gig of ram...
I was thinking, if I flash a 9300 rom and a 9305 modem, will all go well?
Or is it more complex than that?

Thanks in advance.


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