Nim (1.4 ORC) v.s. Rust in terms of safety?

[eyes]

I'm a newbie in both Nim and Rust.

As far as I know, Rust's biggest selling point is memory safety without a 
garbage collector, and thread safety.

Now Nim 1.4 has ORC. Given the use of ORC, is Nim on par with Rust in terms of 
memory safety without GC now (assuming coder only relies on ORC, and does not 
explicitly allocate memory)? How about thread safety?

Thanks and sorry for a newbie question if it's actually obvious. :-)