This set comes in 2 tiles. Question. The 2 tiles in order to work need to be both tiles of THAT particular set or any one tile would work with any other one tile from some other set ? For example, say that one picks TWO teleporter sets and then mixes up the tiles between the 2 sets. Will the 2 teleporter work anyways even if the tiles have been mixed up OR do the pairs need to be the exact 2 ones which spawned as a set when claiming the reward ? Thanks.