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A modified version of the Olami-Feder-Christensen model has been introduced to consider avalanche size differences.Our model well demonstrates the power-law behavior and finite size scaling of avalanche size distribution in any range of the adding parameter padd of the model.The probability density functions of the avalanche size differences at consecutive time steps (defined as returns) appear to be well approached,in the thermodynamic limit,by q-Gaussian shape with appropriate q values which can be obtained a priori from the avalanche size exponent τ.For small system sizes,however,return distributions are found to be consistent with the crossover formulas proposed recently in Tsallis and Tirnakli [J.Phys.Conf.Ser.201,012001 (2010)].Our results strengthen recent findings of Caruso et al.