The suspense ends...
I thought maybe, just maybe, the sock might be a little too long, so I could rip back and make it with the yarn I had. But you can see what happen when I got home and tried it on.
Luckily, when I went to look for yarn to finish out with, I happened to find some leftovers from socks I made for my friend Julie last year, and lo and behold -- the greys match!!!
So I finished it off and you really can't tell unless you really know to look. Whew.
Now sock 2 is through the 1st lace repeat, and I have until July 5 to get it finished up in time to get it in to the state fair.