Correct, the Z does not have a rear "coilover" however for all practical reasons it acts like one except when it comes to calculating spring rates (lever arm effect).
Some racers prefer the "true coilover" because they can swap out shock and spring as one unit if they have multiple sets (configured for different rates). However this can potentially effect car classing for certain racing clubs. The downside to the coilover is that it will reduce the clearance between the wheel and the strut so it might make it difficult to run large wheels. The strut is somewhat inset so it probably isn't that bad.
Most of the OEM replacement suspension leaves the rear spring separate, however they still refer to it as coilovers generically.
As for the price difference in the Zeal, not really sure why the true coilover is cheaper. Could just be the quantity in which each unit is produced.
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