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Quickly glossing over index diachronica, there's no common sound change of p<->d, but p<-b->m with the medial b has instances. (sorry for the syntax, no idea how to express this)

both you and the comment I'm replying to are hilariously hackernews pedantic

consider all the sounds humans can produce

now ask yourself

1) amongst them, if p and d are close (there is no world in which the answer to that is "no")

2) if there are real life examples of languages shifting between them or using them interchangeably (there are, papa and dada being a prime example)

Of course, I did qualify my initial comment with "linguistically", the intention was to be pedantic.

Alveolar for /d/, at least the way I say it.