There are more things in common with A4/AR with Digis than with OT.
DT is directly made from AR. AR MKII got things from DT with the sampling part ! A lot of dna in common.
You have parts, which can be considered as kits saving all samples assignments, fx, etc. Patterns saves notes and musical structures, parts sound settings.
2 different levels of saving it, copy / paste. As on A4/A4, Digis.