Classic Time travel damage difference

HelloSo new player here i want to ask if im suppost to use chromie time to do old content or i can just take a portal lets say to Northrend and i will be able to do the content without using chromie and i will do more damage because i used chromie for northrend and i notice some mage that was level 10 destroying the mobs with two shots but i had to spend like 10-15seconds level 41 to kill one mob does that mean i can just travel to Northrend without chromie help and one shot the mobs there via /r/wow https://ift.tt/3GEgTKj