Finding PACK UVS in workspaces other than UV Editor?

The UV Editor in the Shading workspace does not include PACK ISLANDS.
The UV Editor in the UV Editor workspace does.
So, apparently, menus change in the Editors depending on the workspace?

I kinda assumed that any specific Editor type would have the same menu structure, but that seems not to be the case. Is that correct.

Is it possible to find the PACK ISLANDS command inside the Shading workspace?