ahrefs vs moz | can anybody explain this to me?

How a site with only 4 backlinks can have href DR: 27 and my site have more than 100+ backlinks and have the same href DR?

(My site with more that 100+ backlinks has moz DA: 20 and other site has only DA: 1)

can anybody explain this to me?

It could be the quality of the links, but most likely it's a redirected domain with high DA that passed the DA to the domain in question.

Don't rely on DA or DR these metrics are just tools based and are of no use.

Next thing is they can be manipulated with the right set of links, every tools has its own preferences. Ahref recently blocked such manipulations and many lost there so called high DR.

Remember as much as quality links you make the more these scores increase.

Ahref Metrics (DR) and Moz metrics (DA) are both measurements of domain backlink profile power, however Ahref (DR) is more reliable since it counts mostly good quality links to get the DR.. MOz (DA) doesn't give exact measurement as the DA can be inflated with many spammy backlinks so you can't get the real power of the backlink profile.