theyre all same pipes for both cars i actually have a few as well.
No they are not, the upper ic and lower rubber are different depending on what car you have. The 89 probe ic pipes will not work on a mx6 as the mx6 uses the smaller of the 2 IC like the probe started to use in 90+
As long as the pipes crom from a 90+ or a mx6/626 then he will be fine.
The lower rubber hose from an auto has a small bend to it but will still work in a 5 speed set up.