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The compression ratio is the same for all DOHC. 91 was the year with the 'hot' cams. Every year after that they got 'retuned' slightly for more midrange and torque, along with the ecu.
If you just want the 95 KA into your s13 the easiest (easiest as in not having to worry about rewiring or plugging up a sensor) is just swap the s13 intake and exhaust manifolds onto the s14 KA. I have done this and it works just fine.
kevin
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