Are the Knight tipped boattails the same as the Barnes TMZ. It looks like theyboth offer them in 250 gr or 290 gr?

Last I knew, Barnes made the Knight projectiles. Knight will even tell you to shoot Barnes or Knight projectiles. So if they look alike and are the same weight, I would guess they are the same. The only difference might be a little in price.

Yep there the same...

I know the Knight Red Hots in 250 and 300gr are the same bullets as Barnes MZ Expanders in 250 and 300.