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There are large count of parameters at play but just diameter/coil count/thickness of coil, shape (eg. as with progressive coils), and most importantly - material and manufacturing QA.
By just few of them known i see no way to tell except testing/measuring by yourself.
Any practical case you may need answers to this? Have pile of springs with no specs from manufacturer? Imho known quality spring manufacturers should provide specs for their products w/o need to measure yourself or playing guesswork with just few variables known. Not sure i'd wish to use springs of unknown quality and possible variance in spring rates between them due worse QA in manufacturing.
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