let us suppose the distance lens flange - sensorplane for your different models are the same because sony would not change the autofocus module for every camera. The distance for Sony Alpha is 44.6mm.
You have to check the distance lensflange - tripod mount of the different models. If it is the same, your are ok and can use the settings of the A700. Otherwise, railsetting minus distance A700 plus distance A350.
Concerning the sigma lens i did not find the settings till now. But i am afraid that the settings for th new lens differ from the ones from the old one, cause of different lenses and might be construction. But i would try the old settings first. Otherwise go to camera settings on this site and go to John's Tutorial to find your nnp.