Replacing the strut in and of itself should not change the alignment any - now - if you change the spring and the strut, that will probably change the ride height, which will affect both the camber and toe.
It's not the length of the strut that causes the change in alignment, it's the difference in ride height - if you added a few hundred pounds of winch and bumper so the front end sits lower, the camber will be out (negative), but if you exactly compensate for this decrease in ride height, by adding a spacer or uprated spring, you would bring the camber back to the factory position, but - on the other hand - if your spacer or spring lifted the front end, the camber would then go positive.
By the way - my ARB catalogue says OME struts can be used with the standard springs