SPi - MPi Lambda sensors

[hendrix]

Recently changed the system on my SXi from the SPi crap to the one off my SRi with a manifold from a 1.6MPi astra (SRi manifold didnt wanna come off :evil: ). Anyway the sensor in the SXi manifold wouldnt come out so i used the MPi one even though everyone told me not to. anyway i just wanted to know what the difference actually is because the car seems to be running fine.
cheers
andy

[Ste L]

thought they would of been basically the same

[hendrix]

well tahts what i thought...they look exactly the same, its just some peeps on here said i needed to change it :?