help Some question about Encryption values in PkHex

I found that there are two places about encryption values in pkhex. The first is in the main tab and the second is in pokemon's tab.

What are these two encryption values used for? Are they different?

PID is used for shininess. In previous games it was used to calculate Gender, Ability, and was related to the IVs due to weak Random Number Generation.

EC is used for encrypting the Pokemon's data, its characteristic, and Spinda's spot pattern.

When transferring a past generation Pokémon to Generation VI, the PID is copied to the EC. Under rare circumstances the PID may be modified due to the change in shiny rate (from 8/65536 -> 16/65536); in the case if the PID would then become a shiny PID, the PID would then be modified so that it would stay unshiny.

EC is used for encrypting the Pokemon's data, its characteristic, and Spinda's spot pattern.

And Wurmple's evolution^^

I found that there are two places about encryption values in pkhex. The first is in the main tab and the second is in pokemon's tab.

What are these two encryption values used for? Are they different?

Thanks very much. To be specific, Is EC fixed for a pokemon? When a pokemon's data changes (i.e., level up, train EVs, and even IVs modification), will its EC change? Because in the unencrypted block, checksum will change if a pokemon's data change. I wonder whether a pokemon's EC will also change?

PID and EC do not change.