I've only run Var, so I'm not sure - 10mg Var is fv<k all really (proly not really worth it to be honest) so I doubt it would cause you any trouble to run them together.
Var is a DHT derivative & Tbol is a Test derivative (which doesn't convert to DHT or Aromatize for that matter) so I guess there wouldnt be much overlap in that respect.
I think they're profiles are fairly similar, but from what I can gather I think Tbol will pack on a little more mass than Var - I'd be tempted to run the Var at at least 20mg tho (I run it @ 50mg ED) - I know some people run Tbol as low as 10mg ED so maybe 20mg of each ED might be better - although I have no experience of combining these two so this is all guesswork.