The Claymore anime's ending is quite distinct from the manga. The manga continues the story beyond where the anime stops, with more character developments and plot twists. It's hard to say exactly where it ends in the manga because they deviate quite a lot.
The Claymore anime doesn't cover the manga fully. There are significant differences and omissions. However, both the anime and manga have their own merits and appeal to different audiences.
The Claymore manga ended with a mix of resolutions and some open-ended elements. The main characters faced significant challenges and their fates were revealed in a way that left room for interpretation.
The characters can be integrated by having them meet in a crossover world. For example, Naruto characters could be transported to the Claymore world and vice versa. They could then exchange their fighting techniques. Naruto characters could teach the Claymores about chakra control, while Claymores could show Naruto characters how to use their yoki - enhanced weapons.