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The advertised lengths both collapsed and extended vary some may say considerably. The shock you received(24-011310) is advertised as 10.47/14.37 and the correct "fronts" for a '93 base (24-020534) is advertised as 10.18/13.56.
Maybe call Bilstein or one of their jobbers and ask them directly.
Fit I believe so - "function well" - I'd think you'll either need to find out OR maybe resell to an '88 owner! I'd think there was a reason that the spec was changed in the '89 production.
I agree with the others that on a stock ride height car they should fit fine.
I did some research on the damping rates when I was looking at shocks for my '95. The Z51 shocks have about double the damping rate of the base shocks. I have run the Z51 shocks on my base suspension '94 and '95 and love it.
I have not tried a Z51 rear and base front combination. I suspect they will work fine and probably a lot better than your old shocks (I am guessing you are replacing them because they are worn out.)