Products upload and same

I have a question about products csv upload and i hope that someone can help.

If i have lets say 5 different products,pictures and text but with same model names and all are in same category.
sony 1, sony 1, sony 1, sony 1, sony 1
Products themselves and descriptions are different but model name is same for all 5.

How i can separate all? With sku or ean how?
I would like to search products later by model and if i use search box then i would see or find 5 different products with pictures.
A lot of products and i do not want to make a mess and just try for fun that is why i asked for help.

All ideas are welcome!