Assuming Beibei has x stamps, Lele has x-18 stamps. According to the meaning of the question, after Lele gave Beibei 146 stamps, the number of stamps that Lele had was x-18+146, which was x-17. Therefore, we can get the equation:x-17 = x-18+146. If the equation was simplified to 2x-34 = 146, then x = 69. Therefore, Bei Bei had 69 stamps and Le Le had 69-18=51 stamps. Therefore, Lele had 51-69=-18 stamps more than Beibei.