There's not much difference between an old Marshall and a Fender Bassman either, but one isn't the other.
If any amp was going to be modded into an SLO, the old Yamaha T-100H would probably be the easiet to do,m since it was designed by Mike Soldano in the first place.
The tone stacks have got to be massively different in the DR then, since it would sound Marshally otherwise.
Oh well, I just used to look over the amp tech's shoulder, I'm not an amp repair guy.

Maybe it's posible, but I'd still rather have an SLO to begin with. :p