You're probably in better position to answer since they're right in front of you, and I think physical rather than electric compatibilty is the question.
Diameter and guage light positioning is the first thing I would check for compatibility.
If the vehicle speed sensor (VSS) has different gear ratios for different models (tire size and perhaps drive ratio can vary) then you may also need to change it.
98 Mystique LS v6 atx 110,000km
97 Contour LX v6 atx 125,000km
stock CD on LS, cass on LX
spoiler, tinted windows on LS only
4 wheel discs on LX only
All other available options on both
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