Relation between ISAAC SIM and ISAAC Lab

Hello,
Iḿ a beginner in isaac sim /isaac lab so Iḿ very confused.
Iḿ currently trying to use isaac lab for an RL project where I can control some interpolated points between start and goal positions. I managed to have the interpolation in isaac sim through the _taskspace_trajectory_generator from the motion extension API but now when I want to add RL I discovered that I should use isaac Lab as a learning framework. So I tried to get the same interpolation in isaac lab but there are no APIs that allow me to do this transition / interpolation task which is the first step in my project. I know that the Isaac lab is built upon Isaac sim. But if I want to use an api from isaac sim how can I import it to isaac lab or are they totally separate . If I want to make my custom RL project with stablebaselines can I just use isaac sim or using isaac lab is needed.
Thanks in advance.

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