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For DSLR + lens you'll get away with a smaller (and less expensive) mount. No, you don't need to buy a specific mount for a camera; it's easy enough to fit a camera to an EQ mount made for telescopes. If the camera+lens weighs 1.5 kg then get a mount rated for 3 kg or more. That's generally a good rule of thumb for astrophotography: go for payload rating at least double your actual payload.
Almost any EQ mount except the cheapest nastiest will be usable for a light DSLR+lens. If you want to keep the cost down then get an older one second hand. Just make sure it comes with a RA motor drive (you don't need one for Dec).
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