The process seen below creates sister chromatids that are: (see picture)

identical, because genetic material from homologous pairs can not be transferred.

different, because non-sister homologous chromosomes have swapped genetic material with one another.

identical, because sister chromatids do not swap genetic material.

different, because paternal chromosomes will swap with other paternal chromosomes.

Chromosomes contain DNA molecules highly packaged and wound around histone proteins. Each chromosome has two chromatids joined together at a point called centromere. Crossover is a process that take place during meiosis 1 ( first phase of meiosis), it enhances the exchange of genetic material. During cross over the non-sister chromatids of chromosomes fuse at chiasma where exchange of genetic material takes place.Therefore, it will be correct to say that crossover creates sister chromatids that are different, because non-homologous sister chromosomes have swapped genetic material with one another.