Yes you can freeze sauerkraut and pork together in a freezer safe container.
You can also freeze raw or freshly made sauerkraut in freezer safe containers to keep it a long time but you can also freeze the sauerkraut after it's been added with cooked pork.
I freeze any leftover foods that have sauerkraut on it including pork and it lasts for 6 months and sometimes longer.
The sauerkraut and pork will also last for a few days in the refrigerator if you want to eat it before a few days then refrigerating it would be good.
But if you're gonna keep the sauerkraut and pork longer than a few days then freezing it will be your best option.