Spider Riders: Yomigaeru Taiyou

Both monster battling anime where young heroes battle alongside partners who are very specific to the worlds these stories take place in (beyblades/spiders). Both in this sense have unique world building and have a lot of the same appeal. 

Both classic kids anime. In both the human heroes partner with their sentient creature counterparts to battle alongside eachother (spiders/bitbeasts). Both have simple minded, pure hearted & comedic main characters.  

Both later seasons of kids monster anime. Both feature large casts of child heroes who fight alongside sentient creature partners (bey bitbeasts/spiders). In both their respective kids follow a righteous cause against dark powers. 

Both second seasons of niche kids monster battling anime. Both have creatures that speak with human language and converse the human characters. Both have similar aged human characters. 

Both have partners that are a single species of animal Dinos for DICE and Spiders for Spider riders 

Both monster battling kids anime. Both the companion monsters of the respective series are sentient and talk/communicate to their human counterparts.  

Both second season follow ups of very similar niche monster battling kids anime. Both have intelligent creatures based on real world animals (spiders in spider riders, dinosaurs in dinosaur king). In both a young cast of heroes communicate with, tame and battle alongside these creatures. Both also have comical team rocket style villains as is common for shows targeting this demographic, it is clear these shows are targeting the same audience. 

Both classic kids monster battling anime that are a lot more niche yet similar to more popular shows such as Digimon & Beyblade. Both have sentient creatures based on real world animals. Both have similar aged protagonists. 

Both classic kids monster battling/taming anime. Both more niche alternatives to Pokemon/Digimon style shows.  

Both kids monster battling anime. Both have main characters with similar demeanour and attitudes. Both show's monsters (spider's & bit beasts) appear extremely intelligent. Both have rocking OP's.  

Both the last seasons of kids monster partner anime from a similar era. Both have teams, battles and intelligent creatures. Both series have similar protagonists.  

Both second seasons of kids monster battling anime. Both have great character designs, monster designs and soundtracks. Both have intelligent monsters who sometimes communicate with the human lead characters. Both have great world building. 

Both shows feature a young cast of characters and target the same demographic. They also have monsters that engage in battle alongside the main cast against the forces of evil. Fans of one are more than likely to enjoy the other. 

Both main characters have sidekicks that aren't human. They meet them at the beginning and fight together as partners.