that's correct
More or less, but not really.
Gameplay wise, they're pretty similar. It's turn-based strategy where you can see the animations while attacking/defending (optional). But the main difference is the story progression and customization.
Super Robot Wars is like a linear (with some branching paths) visual novel. You follow the main scenario from start to finish, while recruiting robots from various franchises along the way. You can upgrade their stats and equip parts, and that's it. In SD Gundam G, you can choose to follow which Gundam story you want to enjoy. Each story have several missions, usually in normal and hard mode (or higher). The main attraction of SD Gundam is unit acquisition and customization. In missions, you can choose to capture enemy units by defeating their leader or mothership. You can then sell the unit for cash or use them. You can also level up your units and combine them with another one(s) to create a new unit, or just upgrade it to the next tier (like from GM to GM II). You can also find and recruit various pilots as they don't come with their units.
Cool thanks for the explanation. This seems like it'll be in my wheelhouse, even though I only know a handful of those Gundam series. To the wishlist it goes.