Doubt it, by a MK3 Fiesta do you mean an Astra F? E.g the 1991-98 model?
They are completly different cars but with modified engine mounts, new ECU etc it should be possible but a large amount of work. I know a lot of people put 2.0 Cavilier engines into Corsas but it is a very popular mod so there is many aftermarket products which make the process easier.
Edit even things like the auxs will not be compatable, the Astra F had hydraulic steering where as the Zafera has electro hydraulic I think.
Edited by Rattle on 22/10/2009 at 21:13
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