I really couldn't say as I've not run a losi. But I would imagine it is. These are the top two elite trucks of the racing world and either one is a good choice for someone to drop some $$ on.
Again I'm not positive, but I think with the T4 rtr it would take less to make it into a full blown FT (their top kit) than it would to make a losi rtr into their latest and greatest truck.