"It's definitely a change in mindset," he said.
"But the way Trent bowls inswingers and Dougie bowls outswingers I think they wanted to complement each other from different ends.
"Trent has earned that new ball over the last three months. Coming in first change I suppose I'm adding that little bit of experience and continuity with that line and length approach."
Martin acknowledged that he's not "putting it past the nose as often as I'd like".
"It's a different challenge. You've got to be a little bit more wily when you get older.
"You've got to deal with what you have and your skills. If you land the ball in the right areas for long enough - as we saw with [South African seamer] Vernon Philander - you don't need to be bowling helluva quick. Just with a little bit of guile and get the ball to do a little bit and you're in."
Martin's notable record against South Africa probably ensured he got the third seam spot at Cape Town ahead of left armer Neil Wagner. His improvement as that South African innings wore on may also keep his nose in front for the second test at Port Elizabeth, starting on Friday.
"Certain styles of bowling suit certain types of players and a lot of these guys are front foot press-type guys, and with me bringing the ball back into the stumps they feel they have to play me more.
"There's a lot of ways to get into a guy's head and I suppose by getting him out often enough times that's the way to do it properly.
"I don't think I've lifted another level [against South Africa]. I just think I've got confidence against these guys."
Meanwhile, everyone in the squad, including the five fast-medium contenders, is striving to play in Port Elizabeth against the world's best test side and "I don't think the challenge gets any better".