I know this is a few months old but I came in here looking for an NV thread.
Will digital CCD work for your application? Maybe. Digital CCD is the weakest form of NV. It is not real time, there is a delay based on processing and refresh rate. It might be a fraction of a second, but that can count. If it works for you for this application, great. Don't try using CCD to run through the woods at night because you do need REAL real time image or you will break your ass, a fraction of a second delay is unacceptable. Same with targeting moving game.
The "IR" we are talking about is not IR. IR is radiative heat transport. What we are talking about is "near IR." Long wave light that is just outside of human visible range. And, yes, it is commonly referred to as "IR" by NV companies in short hand. Just want to be clear what we are talking about. I am not familiar with these particular scopes and illuminators, but there is about a 98% chance that the illuminators are visible to humans. They are not generally monochromatic. They will be very dim in many cases, and humans may not notice them unless they are looking right at them, but 98% of them are visible. Of course they will also look like a spotlight at a concert to anyone else with NV. Fortunately, you are not hunting humans, so you worry about that less
But I am a bit of a purist when it comes to NV. There are also animals that are more sensitive to near-IR and to UV (including insects) than humans. I don't think hogs fall into either category.
CCD will have limited range. When it is dark, they depend on the illuminator. As I said, I am a bit of a purist. I prefer Image Intensifiers (II). The range is unlimited, just that resolving a tiny image is limited by photosensativity of the photocathode x resolution ("figure of merit" according to US military and ITAR standards). And it can't give you away to any man, woman, child, or small mammal, none of which do I take s**t from
Thermal is also good and can sometimes reveal creatures that II might not as easily. But the range is usually shorter than II for uncooled detectors and you don't see things as well. Certainly not at the same price.
I really like II for this role. I don't generally hunt, but I use NV a lot and do shoot in the dark. I know a number of people that use NV for hunting and none of them ever used CCD. But if it works, go for it. For II, Gen II is fine in most cases unless you are going to be in the bush with a cloudy sky and no skyglow. Then you need Gen III. I don't think you guys have access to Gen III but I could be wrong. I know the Europeans make some insanely powerful Gen II.
With a riflescope, if you use II, get 25mm tubes instead of 18mm tubes. It makes the scope a tiny bit bigger and a tiny bit heavier but you get a 39% increase in light gathering and a 39% increase in resolution with a tube of the exact same specifications (including the same resolution specification).