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No, there is no difference between 0.7 and 0.7. Both numbers represent the same value, seven-tenths. The leading zero in 0.7 is optional and does not change the numerical value of the decimal.
A "difference" is either the result of a subtraction (the difference between 7 and 5 is 7 minus 5), or its absolute value (so that the difference between 7 and 5 is the same as the difference between 5 and 7).
It doesn't actually mean difference, but it can be used to get the difference between values. 11 subtract 4 is 7, and 7 is the difference between 4 and 11.
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Not necessarily. The difference between a = 7 & b = 7 is 0, and that is not a natural number.