No and yes.
v1.07.3 "Season 5" picks up where v0 89.8 ends. It has two separate routes available to choose from, separately, within it: the main route (3/4ths of the content available in v1.07.3) and the netorare "ntr" route (1/4th of the content in v1.07.3). Players choose which route they wish to play from the main menu. They can choose to play through both, in separate playthroughs, if they wish.
v0 89.8 "Seasons 1-4" has only a main route, with 2 scenes labeled as netorare "ntr" by the developer. One is just a preview of a possible scene that had not seen further development yet. The other is actually netorase.
Both of those are works in progress, in development, versions of Taffy Tales. They are currently no longer being developed. The developer is migrating their content into "final" retail versions, broken out into "Seasons." During the migration, some new content is being added, updated UI, revising art with ai replacements using the developers previous art work.
You can play either or both, one does not require the other, though only playing v1.07.3 may be confusing if you don't play v0.89.8 first. It may still be confusing if you do. Content in them may get changed as they are migrated over into "final" retail versions as Season # Redux.
As for better experience, that is player perception.