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Square planar has four ligands and two lone pairs. A difference between the two is that the bond angles of the square planar shape are smaller than 109.5 because the atoms are pulled closer together by the repulsion of the lone pairs.
I suggest you first figure out the Lewis structure then see if the 4 include any lone pairs, if there is a lone pair it is a square planar and so the angles are different, becuse the lone pairs decrease it through repulsion.
When we want to know just the general shape of the structure, we have to consider all regions of electron density, including lone pairs. Many times, when there are 4 regions of electron density the shape is tetrahedral. When we want to know the molecular structure, we have to consider how the lone pairs affect bond angles and those bond angles may contribute to the square planar shape (4 ligands and 2 regions of electron density).
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