If a piling solution is to be used to enable the construction of permanent works, which will itself perform the function of retaining ground, then a revised set of criteria are used in the design considerations.
Temporary pile solutions are often designed to allow ease of removal; not something considered for permanent piling works. Whereas long-term durability will not be a consideration, choosing a pile section that is sufficiently robust to enable driving and extraction without damage will be an important factor.
Often temporary piles are re-used again and again. Section modulus for temporary works piles may exceed that used for permanent works by some margin.
Temporary solutions are also more likely to be supported by frames or props than those used as part of any permanent works.