Yes this is no problem. Lemmy-ui connects to the Lemmy backend over websocket api. As long as both have the same version they will work together. For example official Lemmy backend installed via Docker, combined with ith manually installed lemmy-ui directly from git repository. You can apply RTL changes to lemmy-ui without any problems as long as you don’t change the api code.
In general backend and frontend should also be compatible if they only differ in patch version (eg 0.17.0 backend with 0.17.1 frontend). But this is not being tested so there is a higher chance that things break.
Yes this is no problem. Lemmy-ui connects to the Lemmy backend over websocket api. As long as both have the same version they will work together. For example official Lemmy backend installed via Docker, combined with ith manually installed lemmy-ui directly from git repository. You can apply RTL changes to lemmy-ui without any problems as long as you don’t change the api code.
In general backend and frontend should also be compatible if they only differ in patch version (eg 0.17.0 backend with 0.17.1 frontend). But this is not being tested so there is a higher chance that things break.