SEV question - new design tech levels?

[Kamog]

How can you tell what version of hull is used in your old ship designs? Does it say anywhere what level of frigate hull, for example, was used in a particular ship design?

I could only try to figure it out by looking at the structure kT...

When copying an outdated component from an old ship design, is there a way to install the old component into a newer hull version? For example, say you have a saved design for an old frigate level 1 which has a depleted uranium cannon level 1. You have now researched up to frigate level 2 and DUC level 2. Is there a way to copy the DUC1 from the old design and place it onto a frigate level 2?