Since the development of an application and the point of view of the API, are there other cryptocurrencies that are the same as bitcoin?

I imagine that some other currencies copy the source code or bitcoin design.

The problem is if you develop applications for bitcoin (using the various APIs, will they work with other currencies with only configurations and / or minor changes?) Specifically P2SH and multisig.

Bitcoin in cash maybe?

Obviously things like ripple, neo and ethereum are completely different.