Generate Info From a Unix Binary

Question

We have a situation where a binary from our build system is failing in one specific flow but the same from dev works fine. We are sure that build system picks up the right libs and code, however we see a difference of 6000 bytes in both. (build - 6000 bytes = size of dev binary)

Hence we would like to know: a. How we can compare two Unix Binaries when they differ only in terms of build boxes (ex dev and build) b. Given a binary (not compiled with debug options) what are the information we can gather from it.

Thanks in advance.