what is the difference between refinitiv data API and lseg data API?

In Workspace codebook, we can found two APIs, one is using lseg data api, eg. import lseg.data as ld, another is using refinitiv api, eg. import refinitiv.data as rd.

May I know what is the difference between the two APIs?

Are all functions (expecially api syntax) the same for the two libraries?

Thanks & Regards,

Dan