I think people have very different ways of approaching family finding. I had a very strong pull towards my son, but to be honest it was then very difficult to step back and look objectively at whether or not I could meet his needs. Because thats the key thing - can you meet the child's needs as far as they are known.
If they are older, as Chestnuttree says it can be helpful to see if you have shared interests.
What is minor to some people may be very important to others. There was a poster here once who was agonising over the colour of a potential child's hair. As a white mum to a black child who looks nothing like me I really couldn't get my head around that. But to them it was really important that they shared physical charteristics with their future child, so not minor in their view at all.
I think it can also be quite scary to take the plunge and say - I think this could be my child. You have only been approved a few weeks. Whilst you will have thought about this moment for a long time, when you see real children its a bit of a shock. Now you have to work out what's really important to you and that's not always easy.
I'd say relax a bit, remember asking to have more information about a child is not a commitment. Maybe take the plunge with one of those children - perhaps when you find out more, thay minor thing will become really insignificant.
Good luck - this is the hardest part I think