DAT Orgo. reactions-acetoacetic ester vs. malonic ester?

[NLP26]

This might be a dumb question but. How do you know whether a reaction undergoes malonic ester substitution or acetoacetic ester substitution? Don't they have the same reagents? How would you know whether you produce a carboxylic acid or a methyl ketone?

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[virajpatel]

Malonic ester has ester on both sides. Acetoacetic has ester only on one side.

 

[NLP26]

Crap, copied it wrong in my notes. Thanks!