Is there a tool to compare structure of two Firebird databases?

Thare are many tools for that - most commercial administration tools have that option. We can also recommend these free ones:

DBComparer - freeware for non-commercial use
http://clevercomponents.com/downloads/dbcomparer/dbcdownload.asp

FBCopy - open source (only compares table fields)
http://fbexport.sourceforge.net/fbcopy.html
http://www.firebirdfaq.org/fbcopy.php

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