帮:1,相助,替别人办事 help like "请帮帮我"
2,物体的外围 something around other things.like "白菜帮 鞋帮子"(But it isn't used most of the time.)
3,团伙,集团 group like"帮派"
扶:1,帮助, help like“扶植”
2,支持,使...不倒 support like ”扶起那棵树“
3,物体让人把持的东西 Handrail ”扶手“
So sometimes they are the same,I hope my answer can help you!