If an advancing PC purchases access to a second specialization tree, do the skills associated with that career and/or specialization become career skills?

If a PC purchases the same talent for the same price from two different specialization trees, do they stack? (e.g., paying 5xp for Grit from Tree A and again from Tree B)

THANKS in advance!

You get the bonus career skills with a new specialization not the career skills for the main career.

You can buy multiple ranks of talents if it is a ranked talent. The descriptions of the talents in that section will specify if the talent is ranked or not. If the talent is a unique one say something like master pilot you don't buy multiple ranks of it.

You gain the specialization skills as class skills, not the class skills. So if you were to pick up the Politico, you would gain all the Politico skills as class skills, but non of the Colonist.

They stack if they are ranked. If not, you simply skip that talent in the second tree without buying it because you already have it.