So I've been browsing the shop lately, and came across these ship upgrades and I do get the general gist of it, it's "upgrading" your ship to one of a different model or a completely new ship. I'm just a bit confused as to the specifics as to how some of these work...

For example, with the upgrade named "RSI Aurora LN Upgrade", does that mean it will upgrade any model of the Aurora you have to the LN for that price?

https://robertsspaceindustries.com/pledge/Upgrades/RSI-Aurora-LN-Upgrade

Basically put, are the ship upgrades limited to their respective models (Are the Aurora upgrades only available from other Aurora models, or Constellation upgrades only from other Constellation models, etc.)?

The Cross-Chassis Upgrades are factored out here because those are straightforward... Upgrade one ship to a different one...