190e clutch slave cyl., pre-90 vs. 90+

[Chamorro]

Hello, I'm wondering if anyone knows the differences in the clutch slave cylinders used in 190e's up to 89 vs. the ones used 90 and later. Does the change in slave cylinder coincide with a change to the fork/release bearing design? Are the cylinders basically the same, or do they have different stroke lenghts and/or pressures? Any info is appreciated. Thanks.