of course they are different.the first one is that the person is not capable for handling so many accounts,may becuz o some limitations,but it doesn't mean he doesn't want to.the second one is that for some reason the person dun wanna handle so many accounts,it's his personal wish.
1.我没有这么多可以使用的账户,所以我需要频繁地查看它们.
2.我不是用这么多帐户,所以我需要频繁地查看它们.