Hmm...
Well there's quite a few genetics that are different but are the same strain or similar anyways. I know there's books you can buy that have the names and all the information.
Not only that but the look of bud even with the same genetics can be drastically variable depending on who is growing it and how they cure it.
Do you have a dispensary that you get your bud from or do you have a street hook?
These are some great books for a strain guide.
There's three volumes so make sure to get all of them.
the big book of buds vol. 1 - Google Product Search
it's a very good investment if you're serious about this.