Does that sliders turtles have red on its head?
The red eared slider does, but the yellow bellied slider does not.
Yes, red eared sliders and yellow bellied sliders are both subspecies of "pond slider", in the wild where their range overlaps they mate quite often producing what are called "intergrades". The particular intergrade between a yellow bellied slider and a red eared slider often has features of both, large yellow markings on the head with a red corner.
If i have turtles but i dont know what species they are will that affect their life and i dont know if my turtles are red eared sliders or water turtles is it possible for them to be both?
Red Eared Sliders are aquatic turtles. They generally spend their time in a pond like environment, and come up to bask in the sun. Image search "red eared slider" to find out. They are very unique looking and very easy to tell what kind of turtle they are. Then, return them wherever you got them. You obviously shouldn't be owning turtles.