3n4/8/3P4/3p4/3K4/8/3N4/3k4 w - - 0 1
In the second variation is a win because the white knight can manoeuvre freely and use distraction when it is needed.
In the first variation is a draw because the white knight is restricted and it can't use distraction.
I pulled these positions above from the Nalimov Tablebase so that we would have a firm understanding of the difference. The positions arise from 1.Nf3 using the most resistant move until the position is reached, then the 1.Nb3 position is derived by choosing the equivalent, symmetrical move from that first line.
Consider these two lines that are the analogs of each other where white has played 1.Nb3 vs 1.Nf3. Why is the first a draw but the other a win?8/3n1K2/3P4/8/8/3N4/2k5/8 w - - 0 1 vs 8/1K1n4/3P4/8/8/3N4/4k3/8 w - - 0 1
Yes, but where in your lines does this matter, and which knight is affected?