Can I run an A9 program under A53 without any modification

I have an  electrical product which is controlled by ARM A9 CPU(linux 3.15+control program).

Now I plan to upgrade the CPU from A9 to A53 and rebuild the linux 3.15.

Is it possible that the control program runs on A53(rebuilt linux 3.15)  without any modification  and any recompilation?  

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