Yes a pressure canner is using a couple inches of water, under pressure for your elevation.
The tempura is around 240-250+ under pressure.
Water bath will not get any higher than boiling point 212 degrees.
Probably the most important part of pressure canning is venting the canner before you start the canning process.
Other than pressure canning isn't a set it and forget it process.
You need to watch the pressure and time.
Venting is letting all the air escape the canner before sealing with a weight or turning a valve shut.
Watching the steam come out of the canner until it is a steady stream of steam.
About 10-15 minutes.
If not vented properly you won't be able to hold a steady pressure.
You can can any meat that is edible.
Beaver to say muskrat is canned the same way.
Just like squirrel and rabbit !
IMHO A pressure canner with a dial gage and a weighted gage are the easiest and safest to use.
This link will give you all the information you need.
I was always told to use the longest canning time for an ingredient for any soups , meaning meat would take 75 to 90 minutes where green beans are 25.
I see they recommend that with seafood but not meat.
Be safe in case of miss print, can meat in soup at recommended meat canning times.
http://www.ag.ndsu.edu/pubs/yf/foods/fn188.pdf