The Player's Handbook feat Tough:
Your hit point maximum increases by an amount equal to twice your level when you gain this feat. Whenever you gain a level thereafter, your hit point maximum increases by an additional 2 hit points
and the Innistrad human provincial origin Stensia racial trait Tough:
Tough. Your hit point maximum increases by 2, and it increases by 2 every time you gain a level.
Seems to have the same name and effect. Do they stack?