Tom and Jerry was more Chuck jones than hanna barbera. they were the release company. you can see similarity's between them and the road runner/ wild e Cayote cartoons from warners. q]
The Hanna-Barbera episodes came earlier, and the Chuck Jones episodes came later. It's fairly easy to tell them apart once you know what you're looking for:
-The Chuck Jones episodes have the roaring lion opening that fades into the close-up of Tom's face impersonating the lion.
-The Chuck Jones episodes have a different, less detailed animation style.
-The Chuck Jones episodes are just flat-out not as funny.