SotKat77

I have done so far 100% completion but not complete some trophies. ( Errand boy 60%, Skin and Deep 97%, Zoologist 63 ). I cannot go back in chapters because i don't have previous saves of the game. So the only way to complete Errand boy is new game as far i as know. If i start new game in rdr2, do i lose all my percentages so far or i have to do only 40% of Errand boy, 3% of Skin Deep and 37% of Zoologist ? When i start a new game, will i have still access to the saves of this game i am playing right now, right ?