Even though we are not talking about pounds, we are talking about alot of oz though right?
About 60 grams. There are 28 grams in an ounce and 16 ounces in a pound.
You are lessening the weight by a little over 2 ounces, not very much.
Also as far as weight distribution goes, I carry my pistol on one side and a spare mag on the other (plus a BUG IWB but that is another story). While the spare mag does not weigh anywhere near the same as the pistol it does seem to help lessen the pull of the gun on the one side.