The two structures shown (left and right) are stereoisomers of 2,4-dibromopentane drawn with opposite wedge patterns at both stereocentres. They are related as

The left structure has descriptors $S$ at C2 and $R$ at C4; reversing both wedges gives $R$ at C2 and $S$ at C4 in the right structure. Since C2 and C4 carry identical groups, numbering the chain from the other end converts (2R,4S) into (2S,4R). Both structures are the meso form of 2,4-dibromopentane, which has a mirror plane through C3. A meso compound is superimposable on its mirror image, so the two drawings represent the same compound.