[acdha]

You'll have extremely close to the same behaviour in both since Debian ships exactly the same versions. It's always possible that there's a compiler bug which only affects one platform but that's relatively uncommon. At one point I was supporting Debian on x86, x86_64, MIPS, and PowerPC. The major portability concern was drivers, which is irrelevant for Docker, and sometimes you'd find performance issues with e.g. OpenSSL having a hand-tuned x86 ASM implementation but relying on the C compiler for another platform but it was rather uncommon.

I am skeptical that anyone will notice a problem unless their workflow is to build a container on their laptop and push it straight to production without testing.