Taslan- sorry, not even close. There are several 45-70 loads, but even using a light 45-70 load, you get about 1200 ft lbs at 100 yds. The .410 gets about 255 ft lbs at 100 yds. 45-70, somewhere around a 400 grain bullet, a .410 slug is about 88 grains. The .410 is a lighter slug, traveling slower. At 100 yards, it is about ONE FIFTH of the energy of a 45-70.
Will it kill a deer? Yeah- got my first deer ever at age 10 with a .410 slug, at about 40 yards. Shot placement critical, expect deer to run while bleeding out- but take out heart/lungs, it will work. Would not be my first choice, not legal everywhere.
What we have here is... failure- to communicate.