Yes, it is about twice their size, around 5000 kb if I remember correctly. Most of the default fonts are around 2500 kb so you could probably get away with losing only one of those and fit it on your V4. But when reformatting memory everything on your sound card gets wiped, so you will need to re-install ALL your soundfonts. Not sure about you but I have major issues backing up the fonts that are stored on my saber from the factory. I have no issues creating and saving new fonts or installing the "default" package from the US website. But there are subtle differences in what comes installed from what is on their website and have yet to figure out how to save the preinstalled fonts from the factory.
^^^^This is why I haven't even bothered with any of this yet. Thanks for the heads up.