It depends on the situation, you could have a simple model with a single material ID and a single diffuse and that should work with just&drop on the model or maybe you have a multi/sub-object material and lots of material ID and this may be a bit more time consuming if you don't know what goes/where. It also depends on the renderer, if you need it for a game engine or not. Most probably you'll have the setup all the inputs like albedo/normal/AO/roughness/metallic (depending on the pipeline). But btw if you have the textures inside the package, it's not the same as re-texturing the whole model, rather just re-assigning material job, which shouldn't take long. I don't know how to further assist you without better knowing the situation unfortunately :P