Yes
Grass carp are quite a feat to catch on the fly..well done!! The carp I have had have all been Commons or Mirrors. Flies for carp tend to be things like Wulffs, dry Daddy Longlegs, large white moth imitations etc. Basically anything that sits on or in the surface film and is big! Carp are curious and will mouth many surface items
My favourite is a "dog biscuit" fly which is basically a muddler head trimes to look like a chum mixer biscuit!
They will also take things like leeches so flies like the Wolly Bugger or black IPN will work.
Lastly, there has been a bit of experimentation with using flies like large leaded blood worm (Apps would work) that are cast to "bubblers"..ie, fish that are feeding on the bottom and that are throwing up bubbles as they do. You might just get a supprise as you may pick up Tench and Eeels as well
Carp fly fishing is a growing sport in Europe and to a lesser extent, the USA. They are much cheaper to stock than Trout, will take a fly, they go back alive so there is no restocking and a 20 pound Carp on the fly is some fish..which I am still trying to get!!