Will I get treated like an newbie when I report in or will this be like another PCS?

You'll always be treated like the fng to an extent even more so in combat arms. But the extent usually depends on you and the way you present yourself to your new direct leadership. Good thing is though in my opinion it's mostly up to you.

You will be treated according to your maturity level.

One advice is to keep your previous enlistment to yourself. Army and Navy are very different animals. If you do your job right and you are always on time, and also don’t call attention to yourself negatively, you will be alright. One last thing, don’t be a pushover, or they will eat you alive.
PS. Stay Hidrate... And remember “I Can Save My Own Life”.

Only if you act like a newbie. You will be interesting until another new person shows up.

You will be a newbie- different service, mindset and way of doing things- just go with the flow and use you knowledge to your advantage.

Will you get treated like a newbie? Hell, as a PFC, you are a newbie.
And if you want some real fun, tell your 19D colleagues that you have experience in the Navy. That will elevate you in their eyes, I am sure. ;)
That said, SGT Breck Wilson has some good advice for you.

In life, you are always boot to somebody. I suspect Heaven and Hell are no different.

EVERYTIME you get transferred ANYWHERE, you are the Newbie. Even if you are the NEW commanding officer. Your troops may not say that to your face, but you will be scrutinized and judged just like you are one. It's called the Name of the Game. Your elders and your superiors have all played it before themselves. Play along, and all will be well.

You are always NEW and it happens to me every three years.

Well , you learned to swim in the Navy. Now you get to learn how to swim in the Army. Enjoy the suck, “ Mud included ! “