They're really close. I would be very pleased. That's way closer than f.ex. Kemper Profiles.They sound very close but I hear slight differences. My ears are highly tuned to this stuff. The two points I made above can be used to eliminate those tiny differences.
While at it, do you have some tips for the Mark series? I keep struggling when comparing the real Mesa Mark series with the amp sims. I feel like the palm mute attack is hard to get as punchy and pointy as on the real amp. The IIC++ amp sim is closest to my Mark V at least.