Hi daffydill
You can’t tell male from female just by their size. Some adult males are smaller than some adult males. Although I have found that, here, the largest males tend to be larger than the largest females. But there is a huge variety in between. Some older females can be quite big.
If the female was very much smaller than the male and not interested, it may be that she is a last year’s hoglet and not ready for breeding yet. The problem is that the other male who you compared her with could also be fairly young.
They do tend to be lighter when they first return from hibernation. But it is really more to do with their shape than their size. i.e. they want to look nicely rounded by the time they have recovered from hibernation. But if you are worried you could try weighing her and discuss it with your local hog carer/rehabilitator.
