Rabada sees the two main forms of cricket slightly differently.
"One-day cricket requires a lot of skill, there's so many plans, wide yorkers, slower ball bouncers, yorkers upfront, back of the hand slower balls," he said.
"(With) test cricket I don't think you will need that many (variations) so you have a bit less of a headache.
"You worry about fields, fine leg, third man but test cricket is going to affect you more mentally in terms of patience and perseverance. You have to adjust and take things at a slower rate."
Fast-bowling prowess has long been a feature of South Africa's test cricket.
The likes of Allan Donald, Shaun Pollock, Dale Steyn, Morne Morkel and Vernon Philander have been big players for their country.
With Steyn recovering from a broken shoulder, and the tall Morkel in the test squad but not long past a back injury, the onus is on Rabada to lead the way.
The ODI series has thrown up the lively Chris Morris as a handy operator.
"It's a new attack," Rabada said.
"We don't have much experience. It's nice that we are going through this together.
"It hasn't been easy for the bowlers because pitches these days are really batsman friendly. We learnt really quickly and we have lots of variety."