Indicate whether the pair of structures shown represent stereoisomers, constitutional isomers, different conformations of the same compound, or the same conformation of a compound viewed from a different perspective. Note that cis, trans isomers are an example of stereoisomers. CH2CH3 -CH2CH3 CH2CH3 CH2CH3 CH3 H3C CH(CH3)2 CH(CH3)2