No.
The + adjacent sibling selector only matches elements when they immediately follow. So the first example would only match the 4th div (plus the 5th, 6th, 7th, 8th, etc.) in a chain of sibling divs, where no other sibling elements break them apart.
“From the 4th div, and all adjacent siblings divs thereafter, until something breaks them apart.”
div:nth-of-type(3) would match the 3rd sibling div regardless of whether other sibling elements were inbetween to break the chain.
“Select the 3rd sibling div, ignoring all other sibling elements.”
div :nth-of-type(3) would match any 3rd sibling element inside a div regardless of other sibling elements.
“Select 3rd sibling elements inside a div, ignoring all other sibling elements.”
You can always try these examples out yourself to see them working, you know.
