I mostly save as 32-bit exr, and/or 16-bit tif. So I opened the tgout, put my name on it and saved as jpg. The one manually saved was a bit adjusted (it needed very little), put a name on and saved as jpg as well. Sent both in, and didn't get a mail by Danny saying they were rejected, so...
I had to anyway, because the tif and exr were around 40MB. Even saving as png in good quality gave a file over 8MB, so max jpg was the way to go.
So I wouldn't worry too much, as far as you don't 'fiddle' with it.