Terrazo: Filling Holes from Tack Strips

I have a terrazo floor that had carpet laid into it with tack strips. They nailed them into the terrazo... silly people trying to give me money.

Anyhow, I need to fill them in. Does anyone have a recommendation for the type of epoxy to use? I will also need the terrazo chips to match. Where would I get something like that?

Then there is the problem of grinding it level the following day. Any guidance on this?

I would greatly appreciate it.