No "Limited" or "Limited Edition" models came to North America... I don't think there were any special edition MA70's at all except for the Group A and Turbo A, but again RHD and JDM only, IIRC. I'm pretty sure there was a limited JZA70.
Factory sunroof was available as of '91. The interior was the same too, there was a change in the grey interior, but that's it.
As for the weight thing, what are the other differences? Turbo vs N/A and hardtop (even with sunroof) vs targa make for a decent difference. The sawblade style rims are also heavy as hell.
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