No, it doesn't change the meaning. The letter bes that starts that word appears with a dot in it usually, but without one after a word (in the same phrase) that ends in an open syllable. (Usually.) The pronunciation changes between these two forms, but not the meaning. It's not unique to this word, either, but true of all words that start with a bes, gimel, dalet, kaf, pe, and tav. It's also true in more generality than just word-initial positions (though not in complete generality) that one of those letters has a dot in it when appearing after a closed syllable and has no dot when appearing after an open syllable. The dot is called a dagesh lene.