They won't explode, but they won't hold pressure, either.
The way a canning jar works, is, as you boil the food in the jar, the lid will let the excess (and very small) pressure escape. But, after you cool them down, the lid will seal and hold the vacuum. (It's only a few inches of vacuum.)
If you try to bottle condition, the lid will allow the pressure to release, and you'll get no carbonation.
(Yes, I have worked in a commercial cannery, as well as canning my own stuff.)
steve