Some of the Tier Abililties are basically identical to other Tier Abilities.
EX.- Tier 1 Scientiest "Technophile" and Tier 1 Inventor "Technophile"
EX.2- Tier 2 Scientist "R&D Specialist" and Tier 2 Inventor "Technical Wizard"
Do these Abilities stack if taken from both Professions? Or can they be interchaged for prerequisits for upper Tier Abilites?