How to know if two assemblies are exactly equal (DEV vs PRD)?

Hi,

I just run into a strange issue.

I have an assembly in production with 158.208 bytes in size ( not size on disk).

The same assembly in DEV has a diferent build date but has the same size in bytes, so i thought their code could be the same.

Since the behaviour was different on the two environments I used reflector to disassembly de dll and found that the production version had a little diference in code (it had a harcode sql string with an extra predicate)

How can this be? shouldn´t the production version (with a bigger sql stmt) had some more bytes in dll size?

How can I evaluate if PRD vs DEV Assemblies are equal if I can't use the assembly size in bytes?

Thanks in advance,

DD