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It depends on the toilet, but if it's not clogged it should be filled to the weir of the trap. If you look at the side of the toilet you can see the built in trap.
If they are identical it should be the same unless there's a slow clog. Bowl water level is not adjustable
Then the toilet's traps are not identical
It's not uncommon for manufacturers to make changes, but keep the same style.
Here's a good diagram of what I explained so poorly.