A página de manual find
explica:
-perm +mode
Deprecated, old way of searching for files with any of the per‐
mission bits in mode set. You should use -perm /mode instead.
Trying to use the '+' syntax with symbolic modes will yield sur‐
prising results. […]
Então, sim, eles são a mesma coisa, mas você deve usar -perm /mode
.