An overview of feature parity - LogRocket Blog
Briefly

"Because this was the longest project I worked on, it went on for two years and the complications and challenges were a juggernaut."
"Feature parity is when you develop a product that will replace the product already in place. To do this, you need to make sure that the new product has equal features or else it will harm the user experience."
"Feature parity is when you ensure the features between two versions of a product remain balanced so that the customer experience isn't impacted."
"At Zalando, we had to make sure that all the features Comet already had were built into Backstage so that the internal users using Comet would be able to keep working as they normally would."
Read at LogRocket Blog
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