The only thing that might be different is that Profinet doesn't keep all the stuff that TCP/IP and Ethernet offers. For example, if you don't need TCP's connection oriented structure, why include it into the software.
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"Perplexity is the beginning of dementia" - Professor Coriolus
If the same hardware and same software were in use, then there would be no difference.
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"Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856