They only share a brand and a subset of filter lists - the implementation and functionality of uBlock Origin Lite and uBlock Origin are entirely different.

When UBOL was released for Safari I switched to it from 1Blocker in hopes of getting a closer experience to the full uBlock Origin, but actually switched back after a few weeks - the filter lists in UBOL were letting through more ads than 1Blocker - and both of them are notably deficient compared to uBlock Origin in Firefox.