DTX 102 iE is the successor of DTX 101 iE.
DTX 102 iE has a somewhat higher impedance and sounds slightly different to DTX 101 iE. In addition, DTX 102 iE comes with a velours bag with a snap lock while the bag for the DTX 101 iE is made of mesh material. The cable of DTX 102 iE has been significantly improved compared to the cable of its successor DTX 101 iE. It is now softer, transmits fewer cable noises (clattering, rumbling, etc.) and gets tangled less.
This also applies for the MMX 102 iE compared to the predecessor model MMX 101 iE.