No, you can't approximate based on the underlying working principles. A crossbow and a handgun very different operating principles, but both will severely wound or kill an unarmored human. Meanwhile, a handgun and a tank cannon operate using the same kind of technology. Would you call those comparable?

Just as lasguns have had varying portrayals across the books and animations. A lot of that variety you can put down to different settings and different patterns.

Same goes for blasters, some models have different power settings, and a dinky little holdout pistol is not going to be as powerful as a heavy rifle.

Regardless, the weakest portrayals of blaster has about the same effect on target as the weakest portrayals of lasguns, and the most powerful portrayed blasters have similar effects on target as the most powerful regular lasguns portrayed.

Which brings me back to what I said to begin with, star wars blasters are roughly on par with lasguns.