Yeah, hopefully mate.
I don’t worry that it has to be “Lamb”, I just let them eat grass until I want one and the bigger they get the better the return.
I killed a 5 year old ewe last time and it was miles better than young lamb and about 4 times the meat.
Couldnt tell you about fat on sheep, I just have not killed enough of them to be a judge but for pigs I like plenty of fat.
Topping up with rolled oats did the trick on my last pigs, great big layer of fat ?