No it's a "style" ... it's not an exact replica.
That's why, in the english language, when something is similar but not exactly the same people will say it is a style.
I've played many NFBC "style" leagues that have some small alterations. Live a little.
*edit* though now that I think about it, with a 7 player bench, I don't see the need for 2DL spots, so I have taken those out.