The reason I would save the edited parts only (the name changes, not the other VST-like data) is so that when you do a RESET, you can merge those changes in the registry without changing any important re-scanned info.
For example, in an update to Sonar, a Prochannel parameter may change, so you need to reset them.
You won't want to merge the entire Inventory registry data - that would re-write old data over the changes, but you would like to change the descriptive names again.