Can a grey zebra finch mate or recognize a white or silver zebra finch?

Yes, I do believe they can. Whether it was a male or female, they both can.

In the white streak, the female can't recognized the male, and flees him, causing him to be aggressive, but you can breed both white., but since you are talking about the grey streak, they definitely can, its also possible for them to breed.

Hope I have helped.