I'm not particularly experienced in breeding hamsters, so I don't really want step in here and say to much on the topic, Hopefully one of the more experienced breeders on the forum will have some light to shed.
I know the interbreeding to create hybrids seems to be looked down on in the hamster enthusiast community for many valid reasons. I found a link that might be helpful to you about breeding different species...
http://www.petwebsite.com/interb.htm
But to give an quick overview of this article some of the cons of interbreeding species are..
~ Loss of babies due to size difference in the hybrids and species of mother.
~Often the hybrids produced from breeding Campbells and Winter Whites together are infertile.
~Although the two species have many similarities they do not occupy the same ranges in the wild and so no interbreeding of the two species occurs in the wild. Therefore interbreeding the two in captivity is unnatural.
In would help if we could see pictures of the male dwarf hamster you are unsure about. Im sure we would be able to tell you what species he is with a clear photo.
Another question you should ask yourself is.. why do you want to breed the hamsters? Are you doing it for the betterment of the species, to create a more healthy and resilient line, or just for the fun of trying?
I wouldn't really recommend breeding unless there is a strong goal and commitment to it. If you do you will have to be prepared for extra "unplanned" litters and have the space and extra cages available to you.
Also, keep in mind that there are lots of hamsters that are in shelters and rescue organizations in need of homes. You will need to take the time to make sure these new little pets are re-homed permanently. I'm sure you wouldn't want to add to the problem of homeless hams.
And welcome to the forum by the way!