Not quite. They explicitly drew a lot of inspiration from OCaml, but they never intended it to be an OCaml compiler for .NET.
F# was – from the start – a functional language designed specifically for the .NET Framework Common Language Runtime. Whenever OCaml and CLR diverged in how they did things, they went the CLR route.
I have a colleague who is very good with C# and F#. We use a lot of C# for work, and for him F# is just a hobby (he has a math background). Because Rust is basically an ML dressed up to look like a semicolon language, and I know I grokked Rust almost immediately with an academic background in SML/NJ and decades of experience writing C, my guess is that this colleague would pick up Rust very easily, but I can't confirm that.
Every Xmas when people are picking up new languages for Advent of Code (which like me he does most years) I wonder if he'll pick Rust and go "Oh, that's nice" - I was going to write a relatively contemporary spoiler here but instead let's say - it's like watching a Outer Wilds player staring at the starting night sky for their fifth or hundredth time wondering if they're about to say "Oh! Why is that different each time?". No. Maybe next time?
Sorry it may not have been clear, I was comparing the experience of knowing he might love Rust (or not) but not knowing if he'll decide to learn it - against the experience of watching unspoiled people playing a discovery game such as Outer Wilds where you know what they don't know yet and so you're excited to watch them discover it. I dunno that's maybe not an experience most people have.
If you either enjoy learning new languages or have a purpose for which Rust might be applicable I encourage you to try it. As you're an F# user it won't be as revelatory as it is for someone with say only C as a background, but on the other hand if you have no bare metal experience it might also be a revelation how fast you can go without giving up many of the nice things you're used to.
If you're a polyglot you probably won't encounter much that's new to you because Rust never set out to be anything unprecedented, I've heard it described as an "industrialization of known best practice" and it's ten years since Rust 1.0 drew a line in the sand.
