To address your specific concern of both options co-existing, I'd say the answer is NO. I don't have any data or study at hand of these coexisting and I never saw such pattern. However, think about this: if you keep loading content.... where are the pages? And if you don't have pages... what are you going to paginate?
Let's try an example: Jane Doe visits eComSite and does a search for a product. The search provides 200 results in blocks of 20 results per page, and she starts to browse through pages looking for the best options. She finds one on page 1, another on page 2, another on page 4. Thanks to short term memory, she will be able to visit a few more pages, but she will remember she already saw something of interest on those pages.
Now, same case with load more (or infinite load): do you think Jane will find the products easily if she continues loading content? Remember that all clues have gone, she doesn't have blocks or pages or any other indication of where she was and where she is, other than a massive amount of content.
As you can see, very different scenarios and very different user flows that demand very different user behavior. So... how do you mix these completely different user flows?
A final consideration would be that if page has no end, then you won't have an end of page to place your navigation. This could be solved with weird patterns such as a floating pagination bar, so I think you should focus on the user cases above: mixing user flows and mindsets is almost impossible, so I'd say the answer is no
Edit: if interested, take a look to these videos or download the slides for this talk, they will help you understand the problem from an scientific point of view