[Q] multi-vpn for at&t d850 stock rom topic

Hi all,

I have a LG G3 D850. I bought it unlocked from AT&T last time I was in the US, but I use it in Brazil. The stock rom would not get the updates and the 4G LTE data plans here in Brazil. I flashed the kitkat and lolipop ROMs from cyanogen and all worked as a charm. But, somehow, I think I prefer the stock over these custom ROMs.

I have the stock rom somewhere, but I am afraid that if I flash that, I will loose the 4G capability for my Brazilian carrier.

When I first flashed the CM12 I got from following this thread, I lacked the multi-apn capability, but after getting the correct multi-apn.zip patch all went smooth.

My question is: will this patch work on the stock LG G3 D850 ROM?

Thanks in advance!
Gustavo