Tt is a genotype different than tt. The first one has two different alleles (T and t) the second one has one kind of alleles (t).
The fenotype of Tt is given by the dominant character (which is the capitalized one, T) while the fenotype of tt is t (because it is the only one).
Then, there are two different genotypes and two differente phenotypes.
Answer: The two have different genotypes and different phenotypes.
