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IWR6843AOP: pcb layer

Part Number: IWR6843AOP

Hi there,

I'm dave hardware engineer

I designed using iwr6843aop. after that, I will make pcb.

So, I found stack-up 

reference : https://www.ti.com/lit/an/swra672/swra672.pdf

But It's hard to get inner layer 61um, prepreg 94um materials.

So PCB company proposed me to changed as below.

Can you let me know it's possible or not? and give me some advice about that.

thank you.