By the way: What sermons do they have similar? Could please name one or some of them?
Did they preached at the same time like on the same Sundays or did one preached after the other?
Maybe God sent these followers of Christ (Men of God) just like other great pastors like Charles Stanley, his son Andy, T.D. Jakes, Joel Osteen, and so on to "Feed His sheep" ( http://www.youtube.com/watch?v=MWaC21NNemU ). I had watch that sermon the other day and I thought that he was great. If you have not already seen and "listen" to this link of Mark Driscoll's sermon, then you may have to listen to it. He preaches about God wants us as christians to Feed His sheep and not hating our brother(s).
I am a New Spring Church member (Owner) and I have been there for over a year. People have been led to Christ every Sunday. If you like, you could look for a similar Sermon of Perry Noble's from http://newspring.cc/series/ and listen to it as well. They maybe similar, but at least they are bringing "The Word" and Point across to help save nonchristians and the people who think that they are christians.
We can not limit ourselves from saving others. Heaven is unlimited. We need more people to be saved and brought to christ no matter who you are.
I hope this helps...