Hello, newbie here.
Is the installation of Replicant on Samsung Galaxy S Advance possible and somewhat working? Should I follow the guide for Galaxy S to install it on my phone?
Short answer: NO. Do not attempt.
Only attempt to install replicant on the devices listed on the main page. If you attempt to install the i9000 replicant on your i9070p, you will be left with a brick the same size, shape, and weight as your GT-i9070p.
Any port to the i9070p would have to be separate and I don't even know how much work would overlap between the two.