What are the main differences between 'Gakuen K' manga and its adaptations?

There aren't many major differences. The adaptations mostly stick to the key elements of the manga.

Overall, the Horitsuba Gakuen adaptations are quite similar to the manga. Some minor tweaks might be in the character designs or the sequencing of events, but they don't change the core story. For instance, the personalities of the main characters remain consistent across both.

The main differences are in some character developments and plotlines. Some minor characters might have more or less focus depending on the adaptation.

Not many major differences. The adaptations mostly stick to the core plot and characters of the manga.

Well, the main differences might be in some character depictions and the pacing. But overall, the core story and themes remain the same.

Hard to say. Maybe the adaptations could have changes in plot, character designs, or the way the story is presented. But without more info, it's hard to give a definite answer.

It varies. Sometimes the adaptations stick closely to the manga, but there can be differences too.

Well, usually the adaptations might have changes in the plot or character designs. Sometimes they cut out some minor details to fit the format.

The main differences might lie in the presentation and possibly some minor plot tweaks. But generally, they stay relatively similar.

Well, one significant difference could be the way the storylines are focused. The manga might have a broader scope, while the yaoi adaptation could zero in on the romantic elements. Also, the art style and tone might vary to suit the yaoi genre.