Question

why do organisms with same base sequence differ from each other

Answer 1

Answer:

This is due to the fact that genome encodes not the exact propagation of the trait, but the limits of variability of a trait. The development of a trait, therefore, depends on multiple factors, which include environmental factors, epigenetic modifications, various intracellular interactions and, to some extent, stochastic (random) processes.

Therefore, do develop exactly same phenotype from a particular genotype, the whole set of factors, which is practically uncountable, should be the same, and that is statistically impossible.