When you are a step-father do you feel that you love the children just the same? I don't have any experience in this area, but was thinking about it recently. I bet it's hard at first.
I suppose that it is more of a conscious choice that has to be made. On the flip side, I've seen some parents who don't seem as caring toward their own children as some step parents.
I don't think the love should be any different. If you are with someone, you have to love their kids like your own or the relationship will never work out. That's how I feel anyway.
It really depends on the relationship you had with your bio children to start with. When my girl were young, I rarely saw them due to my stupidity and the bad relationship I had with their mother. By the time I met my current wife, I had changed and could now allow love in.
I have a step son and it definitely is something that you have be conscious of. Yes, I love him and I am grateful to have him in my life, but to say that I love him as much as I love my daughter is a stretch.
Most of the times it isn't the exactly same love, but it is generally pretty similar. Stepfathers can develop a very close relationship with their stepchildren, especially if the child will allow it and not develop preconceptions, such as the oh-so-common "you can't replace my father"...