I don't know the eyepiece you are referring to, but as you very likely know the eyepieces for 170 and 160 scopes are different (and the TL is not written on them):
170: primary image located 18mm below the end of the tube, i.e. optical TL 152mm
160: DIN standard, primary image located 10mm below the end of the tube, optical TL 150mm
I use 170 Periplan eyepieces with a 8mm extender in my 160 microscope for this reason. Optically they seem to be full compatible. Using 160 eyepieces on 170 stands would not be convenient