Is there any difference between molar mass and molecular mass?If yes then how

The molecular mass and molar mass are two different terms and should not be confused as implying the same meaning. 

The molecular mass of a substance is the sum of the atomic masses of all the atoms present in a molecule of that substance. It is expressed in atomic mass unit (u). Thus, to calculate the molecular mass, the mass of all the atoms present in it are added.

For example, Molecular mass of glucose C6H12O6 is = 6 (C) + 12 (H) + 6 (O) = 180 amu.

The molar mass, on the other hand is the mass of one mole (or 6.023 X 1023) particles of that substance. The molar mass of a substance is numerically equal to the atomic mass or the molecular mass of the substance in ā€˜uā€™ and  is always measured in grams. For example, the molar mass or mass of 6.023 X 1023 molecules of glucose is 180g. Similarly, mass of 6.023 X 1023 atoms of sodium or molar mass of sodium is 23g, but its atomic mass is 23u.  

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Molecular mass is the computed mass from a molecular formula. Always remember that molecular formula shows the actual number of atoms in a substance. It is different from empirical formula as it only shows the ratio between atoms in a substance.
[molecular formula] H2O2: 34 g
[empirical formula] HO: 17 g

Molar mass is the mass of a substance depending on how many moles of substance is taken into consideration.
A mole of H2O: 18 g
Two moles of H2O: 32 g
Three moles of H2O: 44 g,etc

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