I have a Kpro for a 2005 acura rsx and want to know if it can be converted to be used in a 04 honda civic ?

 

According to their website they have one ECU for these models: Civic Si 2002-2005
Civic Type R 2001-2005
RSX Type S 2002-2004
RSX Base 2002-2004
Integra Type R 2002-2006
And another model for 2005-2006 RSX's. It even specifically states "Hondata makes hardware modifications to the 2002-2004 ECU enable it to work with the different sensors and actuators found on the 2005-2006 ECU. After these modifications the ECU will not function correctly on a 2002-2004 RSX."

So the short answer is no. Whether you can remove the modifications made to the ECU to bring it back to normal is something I don't know

 

Is the Civic swapped?

 

Yes, it can be converted back for use in a '02-04 RSX, but it must be sent back to Hondata for the process.