What is difference between close substitutes and perfect substitutes

close substitutes are differentiated goods where most features are common ex toothpastes of different brands
whereas perfect substitutes are homogeneous goods which are exactly similar in terms of size,shape,weight etc.

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perfect sub-example gas or stove, sugar or sugar cubes , pepsodent or colgate
​close sub.-"              bread or bun,jam or sauce, tea or coffee
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