inside of him

[suprunp]

And it seemed that the experience of rewriting Air Chrysalis had begun to change something inside of him.
(H. Murakami; 1Q84)

Can I say "inside him" here?

Thanks.

[Raymott]

And it seemed that the experience of rewriting Air Chrysalis had begun to change something inside of him.
(H. Murakami; 1Q84)

Can I say "inside him" here?

Thanks.

I wouldn't. "Inside him" sounds more literal to me - as if we were talking about his gall bladder or something -- though you probably won't find that distinction in a grammar book.