Brothers,
I don't think so. God clearly states He is no respecter of persons.
The people and happenings in the OT are mostly given as example to us who are now, through faith, the righteousness of God in Christ.
We know, says John, that he hears our prayers and if He hears us He will answer us, one way or another at one time or another.
I think the answers to certain prayers are just longer in coming because they must come in His time according to His will.
Mark 11 from verse 20 "In the morning as they passed by, they saw the fig tree withered from the roots. Peter remembered and said to him, "Rabbi, look! The fig tree you cursed has withered.” Jesus said to them, "Have faith in God. I tell you the truth, * if someone says to this mountain, ‘Be lifted up and thrown into the sea,’ and does not doubt in his heart but believes that what he says will happen, it will be done for him. For this reason I tell you, whatever you pray and ask for, believe that you have received it, and it will be yours. "