I've got several adult sows and boars here, all healthy weighing anywhere between 900g and 1300g - so anywhere in between those weights is fine. It's really a matter of their weight remaining constant over a period of time.
All my pigs (resident and resuce) are weighed each week, same day and roughly the same time. I make a note of it on their chart and then it's easy to see if there is any change. It is normal for it to fluctuate a little up and down but it's a really useful thing to do as it's a good indicator if anything is wrong.
In general terms the boars are often heavier than sows although I have some pretty hefty girls here ;D