Nope, they're handled by the same company so it's not necessarily a rip-off. :thumbs:
And the comparisons you make are kind of pulling at strings. Both are about school so it's understandable that there are similarities.
A lot of seishun high school dramas are very similar in Japan, just keep that in mind. It's pretty normal for both shows to turn out the way they did, especially when you add the Tokusatsu twist.
In the end I feel Fourze pulled off the school theme better - it allowed for more flexibility, whereas Megaranger still felt like generic Sentai.
By the way, I still have a crush on Chisato/MegaYellow :anime: