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I think you will be ok with a smaller battery in the BMW325, as long as you can keep it secure, not sure if the existing hold down clamp will work. A new 500 CCA likely has more reserve power than a 4 year old 850 CCA, you will likely need to change it a little sooner.
The 2004 530I uses the same 850CCA size battery but it has a computer that is running when the car is turned off and needs the reserve. Is your car used every day? How high is the current draw from the alarm system? Not sure if your 993 has any active processing while turned off.
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87 930,
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