The similarities we find from these two theories is that they both aimed on making sure that underdeveloped countries develop in order for them to sustain themselves without being dependent on western countries. 

The differences we find from these two theories is that the modernization theory wanted to bring development by making underdeveloped countries to deviate from their tradition-orientated cultures, which was something the dependency theory never preached. The dependency theory aimed that underdeveloped countries develop while sticking to their tradition and culture.  These theories both received criticism and under the modernization theory it was said that traditional life was regarded as primitive, and under the dependency theory it was said that it pays attention on the external variables instead of the internal factors that actually lead to underdevelopment