I would at first glance agree that these are contradictory positions. But there is possibly a way out for the physicalist here, and that has to do with there being two different ways things can be identical. Think of two 3D-printed objects A and B, and imagine the 3D printer was precise to the atom level. A and B are identical in the sense that their composition is the same. But one could still say that they are not identical in a different sense. One can still look at them and see there are two of them; for A and B to be truly identical, anything true of A must be true of B. https://en.wikipedia.org/wiki/Identity_of_indiscernibles
Therefore, for A and B to be truly identical, destroying object A would have to also destroy object B. Here the criteria fails.
This would also apply to mental states during teleportation. Since you are A, there is no doubt that B will be identical in the first sense, but since you are mental state A you can never be mental state B in the second sense of identicalness. Consider the classical thought experiment that is brought up to defend teleportation death: Upon teleportation, the machine fails and forgets to destroy you, but still creates the second you in the next room; you can go in and meet him. Are you now okay with him putting a gun to your head and pulling the trigger? You might say that it's not you anymore since your experiences have diverged, but does it really make sense for it to work like that? Is there a magic "moment" in which you are identical, and that's when teleportation is a success? Did that mental state of B change in some way because you weren't destroyed? Surely it's not being identical in the first sense that is important here, but the second sense. Smashing 3D printed object A with a hammer doesn't save it just because B is identical to it.