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clarification needed regarding CCS v5.4 compiler version

Other Parts Discussed in Thread: MSP430G2553, CCSTUDIO

I could see an option to choose compiler version while using CCS. I am using CCSv5.4 when i compile a code , code size is about 25% percentage more compared to compiling with CCS V4.2.4. Observe compiler version used in CCS 5.4 is version 4.2.1 instead of  code generation tool version 3.3.3 seen CCS4.2.4

a) why there is a increase in code size for CCS5.4?

b)Is there option to select different code generation version for CCSv5.4, if so, how?