Both examples refer to modified humans, being either cybernetic or external tech enhancing their already superior skills. On both counts, they sound like they'd be at the top of the IG troop performance or possibly on par with Maggard, the bodyguard of Petronella Vivar in Horus Rising and False Gods.
If you transplant them to 40K, they'd both be owned by an Astares of whatever pursuasion, although they may get in a lucky shot if they're underestimated. Astares are built stronger/quicker/tougher/smarter/etc. from the genetic level up, then they're loaded with more tech than either of the characters have, including cybernetic implants of various types. Then you load on decades/centuries of battlefield experience and the cut scenes in whatever current videogame seem somewhat lessened.
The White Zone is for loading and unloading only. If you have to load, or if you have to unload, go to the White Zone. You'll love it... it's a way of life.
: Cigarettes in space?
: It's the final frontier, Nick.
: But wouldn't they blow up in an all oxygen environment?
: Probably. But it's an easy fix. One line of dialogue. 'Thank God we invented the... you know, whatever device.'