Rubber Shore Hardness

Is there a real difference between the properties of rubber of having the hardness value 40 shore 'A' and rubber having the hardness value 50-55 shore 'A'.

My requirement is 40 shore 'A' rubber, but the available is 50-55 shore 'A' rubber. Can I go with 50-55 shore 'A' rubber? Please advise

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