It could also be possible that a different vendor may be used by Apple for its 32GB chips.
you could read the full report by Cellular Insightshere.
source: www.techworm.net
Some iPhone 7 models are faster than others show tests
Tests reveal that some iPhone 7 models are slower than others The 256GB iPhone 7 models have much faster write speeds than the 32GB iPhone 7 models,
