Yes, when using only a couple of layers of fairly lightweight fabric, the peel-plied inner surface is usually flat enough. Making sure that the vacuum bag is generously pleated helps to avoid any unwanted bridges and thicker sections that might affect the fit

The peel-plied finish also gives you a good surface for bonding without need to key it too much

Using two plies of fabric will make the part a little more resistant to cracking during de-mould. If consolidated well, they should offer a great fit and the part shouldn't be more than around 0.5mm thick. A single ply might be more prone to cracking during de-mould, especially on the first couple of pulls where a bit of effort might be needed to get them out